(died 19 October 1557) was a Roman Catholic prelate who served as Bishop of Tlaxcala (1548–1557).
[1][2] Martín Sarmiento de Osacastro was appointed a priest in the Order of Friars Minor.
[2] On 13 June 1548, he was appointed during the papacy of Pope Paul III as Bishop of Tlaxcala,[1][2] and was accordingly consecrated on 7 April 1549 by Juan Lopez de Zárate, Bishop of Antequera.
[2] He was the principal consecrator of Pedro Gómez Malaver, Bishop of Guadalajara (1550).
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