Vasilko Konstantinovich
Vasilko Konstantinovich (Russian: Василько Константинович; 7 December 1209, in Rostov – 4 March 1238) was Prince of Rostov from 1219 to 1238. He was the son of Konstantin of Rostov, and the spouse of Maria of Chernigov. He died in the battle of the Sit River during the Mongol invasions, and was succeeded by his sons Boris and Gleb.