He also had a deep knowledge of Buddhism and compiled "Sanpo-ekotoba" (a Japanese literary collection of Buddhist narratives), "Kuya-rui" (a eulogy for Kuya, a Buddhist priest during the 10th century) and so on.
また仏教にも造詣が深く、『三宝絵詞』『空也誄（くうやるい）』などを撰している。