John of Austria (born 1547)

John of Austria 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.