Sisava

Sisava was once the ruler of a small tribe of yuan-ti, who have been in hiding since they were driven from power aeons ago. When Queen Ixlati arrived from the Shadowfell to seize Ravenmoor, she called all the world's tribes of yuan-ti to her aid. Sisava's tribe turned on him to follow the medusa queen, and he was left with nothing in the sewers of Ravenmoor, where he drunkenly whiled away the rest of his days.