What family lineage was XXX part of?
Basil I
Claims have been made for an Armenian, Slavic, or indeed ``Armeno-Slavonic'' origin for Basil I. The author of the only dedicated biography of Basil I in English has concluded that it is impossible to be certain what the ethnic origins of the emperor were, though Basil was definitely reliant on the support of Armenians in prominent positions within the Byzantine Empire.