Leo I of Galicia

Leo I (c. 1228–1301) was the elder son of Daniel of Galicia. He fought at Yaroslav in 1245 and in 1247 married Constance of Hungary. Inheriting Galicia in 1264, he moved his capital from Halych to Lviv, named for him by his father.

He allied with Nogai Khan's Mongols and lost Black Ruthenia to Lithuania. He died around 1301 with Galicia-Volhynia at its height, and his son Yuri I succeeded him.