The further extension of the Moscow dominion was facilitated by the death of Casimir IV in 1492, when Poland and Lithuania once again parted company. The throne of Lithuania was now occupied by Casimir's son Alexander, a weak and lethargic prince so incapable of defending his possessions against the persistent attacks of the Muscovites that he attempted to save them by a matrimonial compact, wedding Helena, Ivan's daughter. But the clear determination of Ivan to appropriate as much of Lithuania as possible finally compelled Alexander to take up arms against his father-in-law in 1499. The Lithuanians were routed at the Battle of Vedrosha on 14 July 1500, and in 1503 Alexander was glad to purchase peace by ceding to Ivan Chernigov, Starodub, Novgorod-Seversky and sixteen other towns.