Basil Lekapenos
He served as the "parakoimomenos" and chief minister of the Byzantine Empire for most of the period 947 to 985 , under emperors Constantine VII ( his brother-in-law ) , Nikephoros II Phokas , John I Tzimiskes , and Basil II ( his half-sister's grandson ) . 
<triplet> parakoimomenos <subj> Byzantine Empire <obj> applies to jurisdiction <triplet> Nikephoros II Phokas <subj> Basil II <obj> relative