Van wie was María de Mendoza?

John of Austria (German: Johann von Österreich, Spanish: Juan de Austria, often called "Don Juan" or "Don Juan of Austria" in English; 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 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.