The "Genko shakusho" indicates that '[Genbo] associated with Fujimuro (or Toshitsu)' (i.e. he had relations with a married lady of the Fujiwara clan), which is thought to refer to FUJIWARA no Miyako.
『元亨釈書』には、「藤室と通ず」（藤原氏の妻と関係を持った）とあり、これは藤原宮子のことと思われる。