Vasilko Konstantinovich was the Prince of Rostov, ruling from 1219 until his death in 1238. Born in Rostov Veliky to Konstantin of Rostov, he governed the principality during a period of significant historical change. He was married to Maria of Chernigov. His reign ended when he fell during the Mongol invasions at the Battle of the Sit River. Following his passing, his sons Boris and Gleb succeeded him as rulers.