Valletta ( or Valetta) -capital of Malta- was founded by the Knights of Saint John in the mid-1500's . The city was named after Jean Parisot de la Valette, one of the prominent knights, was required to pay a rent of one falcon to Spain for the islands. Valletta has many titles, all recalling its rich historical past. It is the "modern" city built by the Knights of Malta - "The Knights of the Order of St John "; a masterpiece of the baroque; a European Art City; and a World Heritage City. One of the most interesting buildings in Valletta is St. John's Co-Cathedral, which was formerly the conventual church of the Hospitaler order and is now equal in rank with the archbishop's cathedral at Mdina. It was designed by the Maltese architect Gerolamo Cassar and built between 1573 and 1578.