 During his unruly youth, Vladimir begot his eldest son, Sviatopolk, relations with whom would cloud his declining years.His mother was a Greek nun captured by Svyatoslav I in Bulgaria and married to his lawful heir Yaropolk I. Russian historian Vasily Tatischev, invariably erring in the matters of onomastics, gives her the fanciful Roman name of Julia.When Yaropolk was murdered by Vladimir's agents, the new sovereign raped his wife and she soon gave birth to a child.