Leo I of Galicia (Old Ruthenian: Левъ Данилович; Ukrainian: Лев Дани́лович, romanized: Lev Danýlovych; Latin: Leo dux Ruthenorum; c. 1228 – c. 1301) was King of Ruthenia, Prince of Belz (1245–1264), Przemyśl, Galicia (1264–1269), and Kiev (1271–1301).
He was a son of King Daniel of Galicia and his first wife, Anna Mstislavna Smolenskaia (daughter of Mstislav Mstislavich the Bold). As his father, Lev was a member of the senior branch of Vladimir II Monomakh descendants.
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Early life
As a child, Leo took part in the Battle of Jarosław, in which his father defeated the coalition of prince Rostislav Mikhailovich, a pretender to Galician throne, and returned control over Halych. In 1247, Leo married Constance, the daughter of Béla IV of Hungary. In 1252 he supported his younger brother Roman Danylovich in Bohemia during the fight over the Austrian succession of the Babenberg dynasty. Later that year he led Galician troops against the Tatars near Bakota. In the following years Leo helped Daniel to fight against the Yotvingians, Lithuanians and forces of the Golden Horde. In 1262 Leo took part in the meeting of his father and other Rus' princes with Polish duke Bolesław V the Chaste in Ternawa.