天皇 てんのう皇后 こうごう りょう陛下 へいかであれば
tennōkōgo uryōe ikadeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 天皇皇后両陛下

1. If Their Majesties the Emperor and Empress…; If the Emperor and Empress were to…

Ba Conditional