He then married off his daughter TAIRA no Tokuko to Emperor Takakura and established the era in which 'only the members of the Taira clan should be considered legitimate human beings ("Heike Monogatari" ("the Tale of the House of Taira"))'.
娘の平徳子を高倉天皇に入内させ「平氏にあらずんば人にあらず」（『平家物語』）と言われる時代を築いた。