Federico da Montefeltro, also known as Federico III da Montefeltro KG (7 June 1422 – 10 September 1482), was one of the most successful mercenary captains (condottieri) of the Italian Renaissance. He became the lord of Urbino in 1444, and ruled the city as its duke from 1474 until his death. In addition to his considerable reputation for martial skill and honour, he was a renowned intellectual humanist and civic leader. Montefeltro commissioned the construction of a great library, perhaps the largest of Italy after the Vatican's, complete with a team of scribes in its scriptorium. He also assembled a large humanistic court in his Ducal Palace, designed by Luciano Laurana and Francesco di Giorgio Martini.