The Iberian Union was the dynastic union of the Crown of Portugal and the Spanish Crown between 1580 and 1640, bringing the entire Iberian Peninsula, as well as Spanish and Portuguese overseas possessions, under the Spanish Habsburg kings Philip II, Philip III and Philip IV of Spain. The union began as a result of the Portuguese crisis of succession and the ensuing War of the Portuguese Succession and lasted 60 years, until the Portuguese Restoration War in which the House of Braganza was established as Portugal's new ruling dynasty.
The Habsburg king was the only element of connection between the multiple kingdoms and territories, who ruled by six separate government councils of Castile, Aragon, Portugal, Italy, Flanders and the Indies. The governments, institutions, and legal traditions of each kingdom remained independent of each other. Alien laws (Leyes de extranjeria) determined that the national of one kingdom was a foreigner in all the other Iberian kingdoms.
The unification of the peninsula had long been a goal of the region's monarchs with the intent of restoring the Visigothic monarchy. Sancho III of Navarre and Alfonso VII of León and Castile had both taken the title Imperator totius Hispaniae, meaning "Emperor of All Hispania"
The Battle of Ksar El Kebir in 1578 saw both the death of the young king Sebastian and the end of the House of Aviz. Sebastian's successor, the Cardinal Henry of Portugal, was 66 years old at the time. Henry's death was followed by a succession crisis, with three grandchildren of Manuel I claiming the throne: Infanta Catarina, Duchess of Braganza (married to John, 6th Duke of Braganza), António, Prior of Crato, and Philip II of Spain. António had been acclaimed King of Portugal by the people of Santarém on July 24, 1580, and then in many cities and towns throughout the country. Some members of the Council of Governors of Portugal who had supported Philip escaped to Spain and declared him to be the legal successor of Henry. Philip II of Spain marched into Portugal and defeated the troops loyal to the Prior of Crato in the Battle of Alcântara. The troops occupying the countryside (Tercios) commanded by the 3rd Duke of Alba arrived in Lisbon. The Duke of Alba imposed on the Portuguese provinces a subjection of Philip before entering Lisbon, where he seized an immense treasure; meanwhile, he allowed his soldiers to sack the vicinity of the capital. Philip II of Spain was crowned Philip I of Portugal in 1581 (recognized as king by the Cortes of Tomar) and the Philippine Dynasty began. When Philip left in 1583 to Madrid, he made his nephew Albert of Austria his viceroy in Lisbon. In Madrid he established a Council of Portugal to advise him on Portuguese affairs.
Portugal's status was maintained under the first two kings of the Iberian Union, Philip I and his son Philip II of Portugal and Aragon, and III of Castile, generally designated, anachronistically, II and III of Spain, respectively (Spain was the geographical name given to the entire Iberia Peninsula at the time, not of a particular state, nationality or kingdom). Both monarchs gave excellent positions to Portuguese nobles in the Spanish courts, and Portugal maintained an independent law, currency, and government. It was even proposed to move the Royal capital to Lisbon.
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The history of Portugal from the dynastic crisis in 1578 to the first Braganza Dynasty monarchs was a period of transition. The Portuguese Empire's spice trade was peaking at the start of this period. It continued to enjoy widespread influence after Vasco da Gama had finally reached the East by sailing around Africa in 1497–98. Vasco da Gama's achievement completed the exploratory efforts inaugurated by Henry the Navigator, and opened an oceanic route for the profitable spice trade into Europe that bypassed the Middle East.
Due to the complexity in the management of government, the Spanish Monarch needed some auxiliary bodies, as the Councils (Consejos), dedicated to the advice and resolution of problems, and submitted to the Monarch's knowledge and dictum. This complexity needed a permanent seat, and the king Philip II of Spain established in 1562 the permanent capital in Madrid, seat of the Royal Court and of the administrative staff, although transferred in Valladolid, with the whole administrative staff, during a brief period (1601–1606).
As for the functioning, the administrative correspondence came to the different Councils, to Madrid, then the secretary of every Council arranged the material that had to deliver for the attention of the king, and later the King assembled with the secretaries requesting the opinion of the Council. After that, the Council answered afterwards a session to treat the issue and to raise the formal consultation to the monarch. The secretary raise the consultation to the king, and was returned to the Council with his response to be executed. The meetings of the Councils took place in the royal palace, and they did not count on the presence of the king habitually. In this polisynodial system, "Consejo de Estado" (Council of State) stood out for its importance. The Consejo de Estado in Madrid, entrusted to declare on the major decisions that concerned the organization and the defense of the ensemble of the Hispanic monarchy, and it had frequently that to get into Portuguese matters. Even, the Council of War (Consejo de Guerra) exercised its jurisdiction on the troops placed in the Castilian strongholds established on the Portuguese littoral.
And also, there were Councils of territorial character, which functions specialized in a concrete territorial space, the Council of Castile, Council of Aragon, Council of Navarre, Council of Italy, Council of The Indies, Council of Flanders, and the Council of Portugal. The Council of Portugal, established in 1582, was integrated with a president and six (later four) counselors, and it was abolished at the end of the war in 1668, when Charles II of Spain gave up his title as King of Portugal. The function of the Council consists in representing close to the king the courts of the Crown of Portugal for the matters that depend on the justice, grace, finally, the economy of the royal Portuguese domain. Any decision of the king who concerning his Kingdom must do the object of a consultation to the Council before being transmitted to the chancellery of Lisbon and to the concerned courts. The Council of Portugal knows two eclipses: in 1619, for the presence of the King in Lisbon, and between 1639–1658, replaced with the Junta of Portugal. From the Restauração, the Council continued existing, since Philip IV had not recognized the independence of Portugal, and carried out the attending to the faithful Portuguese to the Spanish monarch, and the government of Ceuta.
Relating to the particular government of the kingdom of Portugal itself. During the union of the kingdom of Portugal to the Spanish monarchy, the Spanish Hasburgs on the whole respected the pledges made at Thomar in 1581 to allow considerable Portuguese autonomy and to respected the territories of its empire. Public offices were reserved for Portuguese subjects at home and overseas. The king was represented at Lisbon sometimes by a governor and sometimes by a viceroy. So, Spain left the administration of Portugal and its empire largely to the Portuguese themselves, under general supervision from Madrid channeled through a viceroy in Lisbon. Important matters, however, were referred to Madrid, where they came before the Council of Portugal. In the kingdom of Portugal, the polisynodial system is reinforced:
Nevertheless, the political conjuncture need urgent reactions, and in this context a system of meetings appeared for specific issues, as the Junta for the reform of the Council of Portugal (1606–1607, 1610), the Junta for the classification of the debts to the treasury (since 1627) or the Juntas for the organization of the navies of succor of Brazil (since 1637)...
Throughout the 17th century, the increasing predations and surrounding of Portuguese trading posts in the East by the Dutch, English and French, and their rapidly growing intrusion into the Atlantic slave trade, undermined Portugal's near monopoly on the lucrative oceanic spice and slave trades. This sent the Portuguese spice trade into a long decline. The diversion of wealth from Portugal by the Habsburg monarchy to support the Catholic side of the Thirty Years' War also created strains within the union, although Portugal did also benefit from Spanish military power in helping to retain Brazil and in disrupting Dutch trade. These events, and those that occurred at the end of Aviz dynasty and the period of Iberian Union, led Portugal to a state of dependency on its colonies, first India and then Brazil.
The joining of the two crowns deprived Portugal of a separate foreign policy, and Spain's enemies became Portugal's. England had been an ally of Portugal since the Treaty of Windsor in 1386. War between Spain and England led to a deterioration of the relations with Portugal's oldest ally, and the loss of Hormuz. English help provided by Elizabeth I of England in a rebellion against the kings assured the survival of the alliance. War with the Dutch led to invasions of many countries in Asia, including Ceylon (today's Sri Lanka), and commercial interests in Japan, Africa (Mina), and South America. Even though Portuguese were unable to capture the entire island of Ceylon, they were able to keep the coastal regions of Ceylon under their control for a considerable time. Brazil was partially conquered by both France and the Seventeen Provinces.
In the 17th Century, taking advantage of this period of Portuguese weakness, many Portuguese territories in Brazil were occupied by the Dutch who gained access to the sugarcane plantations. John Maurice, Prince of Nassau-Siegen was appointed as the governor of the Dutch possessions in Brazil in 1637 by the Dutch West India Company. He landed at Recife, the port of Pernambuco, in January 1637. By a series of successful expeditions, he gradually extended the Dutch possessions from Sergipe on the south to São Luís de Maranhão in the north. He likewise conquered the Portuguese possessions of Elmina Castle, Saint Thomas, and Luanda, Angola, on the west coast of Africa. After the dissolution of the Iberian Union in 1640, Portugal would reestablish its authority over the lost territories of the Portuguese Empire. The Dutch intrusion into Brazil was long lasting and troublesome to Portugal. The Seventeen Provinces captured a large portion of the Brazilian coast including Bahia (and its capital Salvador) and Pernambuco (and its capital Olinda). The whole Brazilian northeast was occupied but the Dutch conquest was short lived. The recapture of Salvador by a Spanish-Portuguese fleet in 1625 was followed by a rapid recovery of the lost territories. The Dutch returned in 1630 and captured Recife and Olinda in the captaincy of Pernambuco, the largest and richest sugar-producing area in the world. This began a war over Brazil, which would see the Dutch establish a colony called New Holland. However, the Second Battle of Guararapes, second and decisive battle in a conflict called Pernambucana Insurrection, ended the Dutch occupation of the Portuguese colony of Brazil.
On the other hand, the Iberian Union opened to both countries a worldwide span of control, as Portugal dominated the African and Asian coasts that surrounded the Indian Ocean, and Spain the Pacific Ocean and both sides of Central and South America, while both shared the Atlantic Ocean space.
When Philip II of Portugal (Philip III of Spain) died, he was succeeded by Philip III (and IV of Spain) who had a different approach on Portuguese issues. Taxes raised affected mainly the Portuguese merchants (Carmo Reis 1987). The Portuguese nobility began to lose its importance at the Spanish Cortes, and government posts in Portugal were occupied by Spaniards. Ultimately, Philip III tried to make Portugal a royal province, and Portuguese nobles lost all of their power.
Several other problems also damaged Portuguese support of their union with Spain. One of these was certainly the pressure from the center, especially from the Count-Duke of Olivares, towards uniformity and sharing the financial and military burden of Castile's wars in Europe. However, the Portuguese were hardly inclined to help with that, as Spain had failed to prevent the Dutch occupation of several of Portugal's colonial holdings, despite the fact that both the Portuguese and the Dutch were nominally under the same crown.
This situation culminated in a revolution by the nobility and high bourgeoisie on December 1, 1640, 60 years after the crowning of Philip I. This revolution, while foreseeable, was most immediately sparked by a popular Catalan Revolt against the Crown. The plot was planned by Antão Vaz de Almada, Miguel de Almeida and João Pinto Ribeiro. They, together with several associates, known as the Forty Conspirators, took advantage of the fact that the Castilian troops were occupied in the other side of the peninsula. The rebels killed Secretary of State Miguel de Vasconcelos and imprisoned the king's cousin, the Duchess of Mantua, who had governed Portugal in his name. The moment was well chosen, as Philip's troops were at the time fighting the Thirty Years' War in addition to the previously mentioned revolution in Catalonia.
The support of the people became apparent almost immediately and soon John, 8th Duke of Braganza, was acclaimed King of Portugal throughout the country as John IV. By December 2, 1640, John had already sent a letter to the Municipal Chamber of Évora as sovereign of the country.
The subsequent Portuguese Restoration War against Philip III (Portuguese: Guerra da Restauração) consisted mainly of small skirmishes near the border. The most significant battles were the Battle of the Lines of Elvas (1659), the Battle of Ameixial (1663), the Battle of Castelo Rodrigo (1664), and the Battle of Montes Claros (1665); the Portuguese were victorious in all of these battles. However, the Spaniards won the Battle of Vilanova (1658) and the Battle of the Berlengas (1666). The Battle of Montijo (1644) was indecisive, starting out with great Spanish success and ending with Portuguese success; the number of casualties were nearly equal.
Several decisions made by John IV to strengthen his forces made these victories possible. On December 11, 1640, the Council of War was created to organize all the operations. Next, the king created the Junta of the Frontiers, to take care of the fortresses near the border, the hypothetical defense of Lisbon, and the garrisons and sea ports. In December 1641, a tenancy was created to assure upgrades on all fortresses that would be paid with regional taxes. John IV also organized the army, established the Military Laws of King Sebastian, and developed intense diplomatic activity focused on restoring good relations with England. Meanwhile, the best Spanish forces were pre-occupied with their battles against the French in Catalonia, along the Pyrenees, Italy and the Low Countries. The Spanish forces in Portugal never received adequate support. Nevertheless, Philip IV felt he could not give up what he regarded as his rightful inheritance. By the time the war with France ended in 1659, the Portuguese military were well established and ready to confront the last major attempt of a worn out Spanish regime to reclaim control.
After gaining several decisive victories, John quickly tried to make peace. His demand that Philip recognize the new ruling dynasty in Portugal was not fulfilled until the reign of his son Afonso VI during the regency of Peter of Braganza (another son of John and later King Peter II of Portugal).
there is consensus among professional historians that the most adequate term is Hispanic monarchy