original_query: Who were the reigning leaders/rulers in the history of Ukraine?
query: Who were the reigning leaders/rulers in the history of Ukraine?
answer: This is a complex question encompassing many different groups and periods of Ukrainian history.  The list includes Scythian kings, Kings of the Cimmerian Bosporus, Gothic rulers, Hunnic rulers, rulers of Patria Onoguria, Khazar rulers, rulers of Kyivan Rus', Kings and Princes of Galicia-Volhynia, Princes of Kiev, Voivodes of Kiev, Crimean Khans, Hetmans of Ukrainian Cossacks, leaders during the Ukrainian People's Republic, and Presidents of Ukraine.  Each group had its own distinct titles and periods of rule, spanning centuries.