The Palace complex was built in 1755–1756, led the chief architect was Sultan Hamengkubuwono I (The King I) who founded the Yogyakarta Sultanate. His architectural expertise was appreciated by the Dutch scientist Theodoor Gautier Thomas Pigeaud and Lucien Adam, who considered him a worthy successor of Pakubuwono II (founder of the Surakarta Sunanate). The palace layout, which followed the basic design of the old city of Yogyakarta, was completed in 1755-1756; another building was added by the next Sultan of Yogyakarta. Sultan's Palace is located inside the Sultan's area where also has other sites within; The Water Castle, The Royal Horse Carriage Museum, The Grand Palace Mosque, etc.