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Wiki information Danylovich:
Roman Danylovich, Prince of Black Ruthenia 1254–1258, Prince of Slonim?. He was born as a younger son of Danylo of Halych, a powerful prince of lands east from Poland and later king of those regions, which was most of the times called Volhynia or...
Irakli Danylovich was a Ruthenian prince.