 Onomastics have been seen as supporting Jetté's and Hlawitschka's theory.Among medieval royalty, Agatha's rare Greek name is first recorded in the Macedonian dynasty of Byzantium; it was also one of the most frequent feminine names in the Kievan Rurikid dynasty.After Anna of Byzantium married Yaroslav's father, he took the Christian name of the reigning emperor, Basil II, while some members of his family were named after other members of the imperial dynasty.