Shvarn

[6] In modern times the ruler is known by a variety of names in various historiographies, including Lithuanian Švarnas,[7] Ukrainian Шварно Данилович, Russian and Belarusian Шварн, and Polish Szwarno Daniłowicz.

[8] One of the sons of king Daniel I of Galicia of the house of Romanovich,[9] Shvarn inherited the north-western parts of the Kingdom of Ruthenia, his fathers' domain.

[10] His brother Lev I inherited the southern part of the land, with the cities of Lviv and Przemyśl, while Roman became the heir of duchies of Lutsk and Terebovl.

[12] In 1264 king Daniel of Galicia died and Shvarn received nominal overlordship over all of Kingdom of Ruthenia as its duke.

[12] The following year Bolesław mounted a counter-offensive against Shvarn and his uncle Vasylko Romanovych, and defeated the earlier on June 19, 1266, at Wrota.

In the chaos that followed Mindaugas' assassination, the lands of the Grand Duchy were in disarray, with both local and foreign rulers struggling for power.

Following successful military campaigns, in 1267 he defeated his brother Mstislav in the battle of the Yaselda River and captured Turov and Pinsk.