貞観 じょうがん時代 じだいじゃなかったです
jōgan jidaijanakattadesu

Noun
Desu Copula

The polite, past negative form of 貞観時代

1. It wasn't the Heian period.; It wasn't during the Jōgan era.

Past/Perfective
Negative
Polite
Casual Register