宮中 きゅうちゅう さん殿 でんだったら
kyūchūsandendattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 宮中三殿

1. If/when it were the three palaces of the Imperial Palace:; If/when it had been the three palaces of the Imperial Palace:

Tara Conditional