Martín Sarmiento de Osacastro, O.F.M. (died 19 October 1557) was a Roman Catholic prelate who served as Bishop of Tlaxcala (1548–1557)."Bishop Martín Sarmiento de Osacastro, O.F.M." Catholic-Hierarchy.org. David M. Cheney. Retrieved 4 January 2017
Biography Martín Sarmiento de Osacastro was appointed a priest in the Order of Friars Minor.
On 13 June 1548, he was appointed during the papacy of Pope Paul III as Bishop of Tlaxcala, and was accordingly consecrated on 7 April 1549 by Juan Lopez de Zárate, Bishop of Antequera.
He was the principal consecrator of Pedro Gómez Malaver, Bishop of Guadalajara (1550). In 1555, he attended the First Mexican Provincial Council.
Osacastro died on 19 October 1557.
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