In Twelfth Night, he is a ship captain.
In The Two Gentlemen of Verona, he is the father of Proteus. In Twelfth Night, he is a ship captain. In Much Ado About Nothing, he is the brother of the Governor of Messina. In The Tempest, he is Prospero's brother and usurping Duke of Milan. Okay, so they're not really all the same person, but they do share, for 10 points, what name with the title character of The Merchant of Venice?
In The Two Gentlemen of Verona, he is the father of Proteus.
{Antonio}