天平勝宝 てんびょうしょうぼうではありませんでした
ten byō shōbōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 天平勝宝

1. Was not a scale-winning treasure.; Was not a prize-winning treasure.

Past/Perfective
Negative
Polite
Formal Register