Alfonso of Aragon

Alfonso of Aragon (1481 – 18 August 1500) was the Duke of and the second husband of Lucrezia Borgia.

Before Alfonso married Lucrezia, her brother Cesare was impressed by his handsome looks and kind nature. However, once Lucrezia was happily married to Alfonso, she paid Cesare less romantic attention.

Wanting Lucrezia for himself, Cesare had Micheletto Corella murder Alfonso, causing Lucrezia great distress. In retaliation, she rebelliously entered into affairs with men such as Patrizio and Pietro Rossi.

Reference

 * Assassin's Creed: Brotherhood