This ivory is an Egyptian ivory made in the 14th century. On the full size carving are three figures, the first carrying a Greek cross-
The second figure is a crowned man with a sword-
The third figure is of an acolyte, carrying a censor and a cross-
The last figure is a man in a turban and a wine flask-
When written up in Ernst Kühnel‘s book ‘Die Islamischen Elfenbeinskulpturen’, the ivory was thought to have been made in the 12th century in Italy, Spain or Sicily. A review of the book can be found in JStor.
The ivory is in the British Museum.
Die islamischen Elfenbeinskulpturen by Ernst Kühnel. Via Google Books.
Muqarnas, Volume 16: An Annual on the Visual Culture of the Islamic World edited by Gülru Necipoğlu. Via Google Books.
The Oliphant: Islamic Objects in Historical Context by Avînoʻam Šālēm. Via Google Books.