The hill of Chaillot was first arranged for the 1867 World's Fair. For the 1878 World's Fair, the (old) "Palais du Trocadéro" (1878-1936) was built here (where meetings of international organizations could be held during the fair). The palace's form was that of a large concert hall with two wings and two towers; its style was a mixture of exotic and historical references, generally called "Moorish" but with some Byzantine elements. The architect was Gabriel Davioud.