せいりょうじゃなかったです
西遼じゃなかったです
seiryōjanakattadesu

Noun
Desu Copula

The polite, past negative form of せいりょう

1. Wasn't the Western Liao.; Wasn't Xiliao.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana