Martinho was born about 1172. He is the son of Sancho I Portugal and Maria Aires de Fornelos.
Sancho I and his mistress, Maria Aires de Fornelos, daughter of Aires Nunes de Fornelos and Maior Pais, who was buried at the Monastery of Santo Tirso in accordance with her last will, Sancho had two children, both born before his marriage to Dulce of Aragon. These two are: Martin (Martinho) Sanches (born before 1175 (Count of Trastámara. Martin married Elo Pérez de Castro, daughter of Pedro Fernández de Castro, with no issue from this marriage; and Urraca Sanches (born before 1175),was married to Lourenço Soares, son of Soeiro Venegas and Sancha Bermúdez de Traba.
Martin died in 1260[1]
Catalogo historial genealogico de los Senores y Condes de la casa y villa de Fernanunez... By Luis de Salazar y Castro
História de Portugal, Volume 1, F. de Almeida, 1922 - Portugal
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