Siemowit VI of Płock (pl: ''Siemowit VI płocki''; 2 January 1446 - 31 December 1461/1 January 1462), was a Polish prince member of the

House of Piast The House of Piast was the first historical ruling dynasty of Poland. The first documented Polish monarch was Duke Mieszko I (c. 930–992). The Piasts' royal rule in Poland ended in 1370 with the death of king Casimir III the Great. Branc ...

from the Masovian branch. He was a Duke of

Płock Płock (pronounced ) is a city in central Poland, on the Vistula river, in the Masovian Voivodeship. According to the data provided by GUS on 31 December 2021, there were 116,962 inhabitants in the city. Its full ceremonial name, according to th ...

Rawa Mazowiecka Rawa Mazowiecka is a town in central Poland, with 17,193 inhabitants (2020). It lies in the Łódź Voivodeship and is the capital of the Rawa County. From 1562 the city hosted the ''Rawa Treasury'' for the Polish army. During an excavation in 1 ...

Belz Belz ( uk, Белз; pl, Bełz; yi, בעלז ') is a small city in Lviv Oblast of Western Ukraine, near the border with Poland, located between the Solokiya river (a tributary of the Bug River) and the Richytsia stream. Belz hosts the adminis ...

Płońsk Płońsk (; yi, פּלאָנסק, Plonsk) is a town in central Poland with 22,500 inhabitants (2010). Situated at the Płonka river in the historic region of Mazovia, it is the seat of Płońsk County in the Masovian Voivodeship. History Ac ...

, Zawkrze and

Wizna Wizna is a village in Łomża County of Podlaskie Voivodeship, in north-eastern Poland, situated on the Narew River. Wizna is known for the battle of Wizna which took place in its vicinity during the 1939 Invasion of Poland at the start of Worl ...

during 1455-1461/62 (under regency until 1459) jointly with his brother, since 1459 ruler over

Gostynin Gostynin is a town in central Poland with 19,414 inhabitants (2004). It is situated in the Masovian Voivodship since 1999 and was previously in the Płock Voivodship from 1975 to 1998. It is the capital of Gostynin County. History Gostynin h ...

.O. Balzer, ''Genealogia Piastów'', Kraków 1895, s. 516. He was the eldest son of

Władysław I of Płock Władysław I of Płock (1406/09 - 11/12 December 1455), was a Polish prince member of the House of Piast from the Masovian branch. He was a Duke of Płock, Rawa Mazowiecka, Gostynin, Sochaczew, Belz, Płońsk, Zawkrze and Wizna during 1426-143 ...

and

Anna Anna may refer to: People Surname and given name * Anna (name) Mononym * Anna the Prophetess, in the Gospel of Luke * Anna (wife of Artabasdos) (fl. 715–773) * Anna (daughter of Boris I) (9th–10th century) * Anna (Anisia) (fl. 1218 to 12 ...

, daughter of Duke Konrad V of Oleśnica.

Life

After the death of their father on 11/12 December 1455, Siemowit VI and his brother Władysław II inherited their domains; however, because at that moment they are minors, the regency was held by their mother and Paweł Giżycki, Bishop of Płock. At the beginning of 1459 Siemowit VI attained his majority and began his personal rule according to law, however in practice his regents continue to had the real power. The first independent move of Siemowit VI took place at the convention of

Czersk Czersk (; ; formerly german: Czersk, (1942-5): ) is a town in northern Poland in Chojnice County, Pomeranian Voivodeship. As of December 2021, the town has a population of 9,844. Today the center of the city of Czersk in is the Village Square. ...

, where he, together with Duke Konrad III the Red, made a peace treaty with the Teutonic Order. In this way, the young prince followed his father's policy of not engaging in conflicts with the Order, despite that the Polisht King was in a war with them. Shortly after he attained his majority, Siemowit VI's lands where further expanded with annexation of the district of

after the death of his aunt Margaret of Racibórz, widow of Siemowit V, who obtained this land after her husband's death as her

dower Dower is a provision accorded traditionally by a husband or his family, to a wife for her support should she become widowed. It was settled on the bride (being gifted into trust) by agreement at the time of the wedding, or as provided by law. ...

. Siemowit VI died on the night of 31 December 1461 on 1 January 1462. He was buried at Płock Cathedral. The sudden death of the young prince and one month later of his brother Władysław II caused many rumours of poisoning. The charges of murder were directly towards the Castellan of

Sochaczew Sochaczew () is a town in central Poland, with 38,300 inhabitants (2004). In the Masovian Voivodeship (since 1999), formerly in Skierniewice Voivodeship (1975–1998). It is the capital of Sochaczew County. Sochaczew has a narrow-gauge railway ...

, Gotard of Rybna, who allegedly was offended because the princes deprived him of a country state. This sensational accusations, however, are generally rejected, since was well known that chronicler

Jan Długosz Jan Długosz (; 1 December 1415 – 19 May 1480), also known in Latin as Johannes Longinus, was a Polish priest, chronicler, diplomat, soldier, and secretary to Bishop Zbigniew Oleśnicki of Kraków. He is considered Poland's first histo ...

(who was a contemporary of the princes) disagreed these rumours. Perhaps the real reason of the death of both brothers in a short space of time was

tuberculosis Tuberculosis (TB) is an infectious disease usually caused by '' Mycobacterium tuberculosis'' (MTB) bacteria. Tuberculosis generally affects the lungs, but it can also affect other parts of the body. Most infections show no symptoms, i ...

, which, moreover, was the cause of their father's death.

Reference

{{DEFAULTSORT:Siemowit 06 of Plock Dukes of Masovia 1446 births 1462 deaths