It could be seen in "Okagami" (the Great Mirror) and "Eiga Monogatari" (A tale of flowering fortunes) that he impregnated FUJIWARA no Suishi, who was the Nyogo (court lady) of Emperor Sanjo while he was the Imperial Prince, and the Imperial Prince, who became suspicious, ordered his paternal older brother FUJIWARA no Michinaga to inspect Suishi.
『大鏡』『栄花物語』の諸書によると、三条天皇東宮時代の女御、藤原綏子に通じて懐妊させ、疑わしく思った東宮が綏子の異母兄藤原道長に命じて検証させた、とある。