The Kallergis (Greek: Καλλέργης) family is a Cretan family said to be descended from Byzantine Emperor Nikephoros II Phokas (Latinized: Nicephorus II Phocas, Greek: Νικηφόρος Β΄ Φωκᾶς, Nikēphoros II Phōkas), and were at one stage rulers of Crete. == The history of the twelve byzantine rulers == Emperor Alexios II Komnen...