The County of Trastámara (Spanish ''Condado de Trastámara'') was a tenancy of the crown in the

Kingdom of Galicia The Kingdom of Galicia ( gl, Reino de Galicia, or ''Galiza''; es, Reino de Galicia; pt, Reino da Galiza; la, Galliciense Regnum) was a political entity located in southwestern Europe, which at its territorial zenith occupied the entire north ...

in the

Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...

. Its name comes from the

Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...

''tra(n)s Tamar(is)'', meaning "beyond orth ofthe

Tambre Tambre is a ''comune'' (municipality) in the Province of Belluno in the Italian region Veneto, located about north of Venice and about east of Belluno. Tambre borders the following municipalities: Aviano, Barcis, Budoia, Caneva, Chies d' ...

", a river which runs through Galicia. It was regularly granted to men of a single family, the

House of Traba The House of Traba (or Trava), sometimes called the Fróilaz-Traba, was a Galician noble family of the high Middle Ages. The family can be traced back to the eleventh century. They are associated with a castle named Traba, probably in the county o ...

from the 11th century into the 13th, after which it was often given for life to others, including Alvar Núñez Osorio and the future King

Henry II of Castile Henry II (13 January 1334 – 29 May 1379), called Henry of Trastámara or the Fratricidal (''el Fratricida''), was the first King of Castile and León from the House of Trastámara. He became king in 1369 by defeating his half-brother Peter th ...

, whose dynasty is thus known as the

House of Trastámara The House of Trastámara (Spanish, Aragonese and Catalan: Casa de Trastámara) was a royal dynasty which first ruled in the Crown of Castile and then expanded to the Crown of Aragon in the late middle ages to the early modern period. They were a ...

. On 4February 1445 in

San Martín de Valdeiglesias San Martín de Valdeiglesias is a town of Comunidad de Madrid with a population is 8,190 people. History The Castle of Coracera was built in the fifteenth century. Geography San Martín is near to Cadalso de los Vidrios, Pelayos de la Pres ...

, it was granted as a hereditary possession to Pedro Álvarez Osorio by

Juan II of Castile John II of Castile ( es, link=no, Juan; 6 March 1405 – 20 July 1454) was King of Castile, King of Kingdom of Castile, Castile and Kingdom of León, León from 1406 to 1454. He succeeded his older sister, Maria of Castile, Queen of Aragon, as ...

Counts

House of Traba The House of Traba (or Trava), sometimes called the Fróilaz-Traba, was a Galician noble family of the high Middle Ages. The family can be traced back to the eleventh century. They are associated with a castle named Traba, probably in the county o ...

* Froila Bermúdez de Traba (d. 1091) *

Pedro Fróilaz de Traba Pedro Fróilaz de Traba ('' fl.'' 1086–1126) was the most powerful secular magnate in the Kingdom of Galicia during the first quarter of the twelfth century. According to the ''Historia compostelana'', he was "spirited ... warlike ... of great p ...

(r. 11251126, d. 1128), son of prec. *

Fernando Pérez de Traba Fernando (or Fernán) Pérez de Traba (''c''.1090–1 November 1155), also Fernão Peres de Trava ( or ) in Portuguese, was a nobleman and count of the Kingdom of León who for a time held power over all Galicia. He became the lover of Countess T ...

(r. 1132–1145, d. 1155), son of prec. *

Gonzalo Fernández de Traba Gonzalo Fernández de Traba (died 1160) was a Galician nobleman and the head of the Traba family. He was the eldest son and successor of Fernando Pérez de Traba by his wife Sancha González. By 1 August 1150 Gonzalo had married a certain Elvira ...

(r. 1155–1159, d. 1165), son of Fernando Pérez *

Fernando González de Traba Fernando González de Traba or Fernão Gonçalves (''fl.'' 1159–1165) was a Galician magnate and the head of the House of Traba in the Kingdom of León during the reign of Ferdinand II. He was the eldest son of Gonzalo Fernández de Traba and El ...

(r. 1161–1165, d. 1165), son of prec. *

Bermudo Pérez de Traba Bermudo Pérez de Traba (died 1168), the eldest son of Count Pedro Fróilaz de Traba and his first wife Urraca Fróilaz, was a member of the most important Middle Ages, medieval lineage in Galicia, Spain, Galicia. He governed as a ''Tenant-in-chie ...

(d. 1168), son of Pedro Fróilaz *

Gómez González de Traba Gómez González de Traba (''fl.'' 1164–1209) was a Galician nobleman, a count from 1169, and a wealthy and influential figure in the Kingdom of León. He was the second son of Gonzalo Fernández de Traba and his first wife, Elvira Rodríguez. H ...

(r. 1165–1208, d. c. 1211), son of Gonzalo Fernández * Rodrigo Gómez de Traba (r. c.1220–c.1260, d. c. 1261), son of prec.

House of Osorio The House of Osorio is a Spanish noble lineage of the Crown of Castile. They descend from count Osorio Martínez, a prominent nobleman in the first half of the 12th century who was member of the Flagínez family and husband to a granddaughter of ...