Shvarn

King Daniel of Galicia dies in 1284 and Shvarn, one of his sons, receives nominal overlordship over all of the Kingdom of Galicia–Volhynia as its duke.

Immediately, he mounts a major campaign against Poland, this time aiming for Lesser Poland.

However, although joint armies manage to plunder Skaryszew, Tarczek and Wiślica, this time the campaign is less successful and the allied Ruthenian and Lithuanian armies are repelled.

The Yotvingian auxiliaries are defeated by Bolesław V the Chaste at the Battle of Brańsk.

Mindaugas of Lithuania had been murdered in 1263, and in the ensuing chaos, the lands of the Grand Duchy are in disarray, with both local and foreign rulers struggling for power.

Shvarn gives his support to Vaišvilkas, one of Mindaugas' sons and his brother-in-law.

Together, they manage to depose Treniota and expel Daumantas all the way to Pskov.

Boleslaw mounts a counteroffensive against Shvarn and his uncle Vasilko Romanovich and defeats the former on June 19, 1266 at Wrota.

This weakens Shvarn's position in his own domain.

Shvarn, following successful military campaigns, defeats his brother Mstislav in the battle of the Yaselda River in 1267, and captures Turov and …

…Pinsk.

Shvarn becomes the new Grand Duke in 1267 after Vaišvilkas returns to monastic life.

No details are known about Shvarn's rule over Lithuania and he probably did not gain a strong foothold in that country.

However, he is apparently fairly successful in expanding his borders.

Shvarn next campaigns against the Volga Tatars and defeats khan Balaklay in the battle of Kojdanow (modern Dzerzinsk, Belarus), which allows Shvarn to capture the towns of …

…Mozyr, …

…Chernigov, …

…Karachev and …