 Complete the following phrase:  At the end of the 12th century, some northern parts of Macedonia were temporarily conquered by Stefan Nemanja of Serbia. In the 13th century, following the Fourth Crusade, Macedonia was disputed among Byzantine Greeks, Latin crusaders of the short-lived Kingdom of Thessalonica, and the revived Bulgarian state. Most of southern Macedonia was secured by the Despotate of Epirus and then by the Empire of Nicaea, while the north was ruled by Bulgaria. After 1261 however, all of Macedonia returned to Byzantine rule, where it largely remained until the 