There remained an elevated base mound called 'Daikoku no Shiba' (grass mound of Daikoku) until the Edo period, and later it was excavated and proven to be the remains of the Second Daigokuden.
第二次大極殿跡は近世まで「大黒（ダイコク）の芝」と呼ばれた基壇が残っており、のちの発掘で第二次大極殿跡と確定された。