This is a miniature of a Turkish horse archer, which was labelled Ottoman on Wikimedia Commons but I am not sure. However, there are some actual armour still surviving in the Ottoman Military Museum.The armour is in Musee de l’Armee, Paris. Taken from Wikimedia Commons.This picture was taken from Wikimedia Commons. The Turkish cavalry had the name Sipahi, one of the famous being Ulubatlı Hasan who died at the Seige of Constantinople.The Cavalry can be seen on the far left of the picture, which was done by Jean Chartier in the Bibliothèque nationale de France Manuscript Français 2691 folio CCXLVI v  in the late 15th century. Taken from Wikimedia Commons.