Who dated María de Mendoza?

María de Mendoza (Soria, h. 1550/1552 -Madrid, 18 de enero de 1572), dama de la infanta y princesa viuda de Portugal Juana de Austria, fue amante de Juan de Austria y dio a luz una hija de él, María Ana de Austria.

John of Austria (German: Johann von Österreich, Spanish: Juan de Austria; 24 February 1547 – 1 October 1578) was the illegitimate son of Charles V, Holy Roman Emperor. Charles V recognized him in a codicil to his will. John became a military leader in the service of his half-brother, King Philip II of Spain, Charles V's heir, and was addressed to as a Don. He is best known for his role as the admiral of the Holy League fleet at the Battle of Lepanto and as Governor of the Spanish Netherlands.