According to 'Matsu no ochiba' (a book on Shinto) written by Takanao FUJII, in the section of investiture of the Empress in 'Gokeshidai' (the Ritual Protocol of the Oe House), it is described that 'Two Shishi-shaped guardian dogs shall be placed on the left and right sides in front of the south face of the chodai.'
藤井高尚「松の落葉」によれば、「江家次第」立后の条に「師子形二」「師子形（二）御帳南面左右（一）」（（一）（二）は返り点）とある。