After Sultan Mehmed II's conquest of Constantinople in 1453, the Great Palace of Constantinople was largely in ruins. The Ottoman court was initially set up in the Old Palace (Eski Saray), today the site of Istanbul University in Beyazit Square. Mehmed II ordered that construction of Topkapı Palace begin in 1459. According to an account of the contemporary historian Critobulus of Imbros the sultan "took care to summon the very best workmen from everywhere – masons and stonecutters and carpenters ... For he was constructing great edifices which were to be worth seeing and should in every respect vie with the greatest and best of the past."