Daniel of Galicia

Daniel Romanovich (1201–1266) was Prince of Galicia (1205–1207; 1211–1212; 1230–1232; 1233–1234; 1238–1266), Volhynia (1205–1208; 1215–1238), Grand Prince of Kiev (1240), and King of Ruthenia (1253–1266). He was the son of Roman Mstislavich of Volhynia and Anne-Euphrosyne, the daughter of Byzantine emperor Isaac II Angelos.

Under Daniel's long rule the Romanovichi branch of Rurikids restored control over Galicia, and the reunited principality rose to become a prominent power, eventually being elevated to the status of a kingdom. Daniel's rule managed to withstand the Mongol invasions, making him a defining personality in the latter period of the existence of Kievan Rus' following the decline of Kiev. The Galician-Volhynian Chronicle praised Daniel as an exemplary ruler, brave warrior and wise statesman, whose qualities as a monarch made him second only to Solomon.

Source: Wikipedia — https://en.wikipedia.org/wiki/Daniel_of_Galicia