In 1998 the historic centre of Urbino was declared a World Heritage Site because it represents the peak of Renaissance art and architecture. It attracted some of the most distinguished Renaissance humanists and artists, including Piero della Francesca, Leon Battista Alberti, Paolo Uccello and Raffaello Sanzio. Thanks to these artists this exceptional urban complex became one of the most important and admired Courts in Europe. Duke Federico da Montefeltro, the archenemy of Sigismondo Pandolfo Malatesta, had his imposing residence here: the Palazzo Ducale, now the headquarters of the Galleria Nazionale delle Marche. Urbino is also the place where one of the oldest universities in Europe was founded. It still attracts students from all over the world.