おった

was, were; had been

→ おる
おっ be (doing), be (in a state) + た Past tense
auxiliary · past tense Rare #38,463
was, were; had been A past form of おる used after a verb in て-form. This auxiliary use is old-fashioned or dialectal; in standard modern Japanese, いた is more common.
JA: 彼はそこで待っておった。
EN: He was waiting there.
Conjugation of おる

さっきの人がそう言っておったぞ

The person who was here earlier said so.

— ハウルの動く城 (2004)

そなたの兄がずっと守っておったのだ

Your older brother has been protecting it all this time.

— ロード・オブ・ザ・リング/王の帰還 (2003)

こいつのことをすっかり忘れておった

I'd completely forgotten about this guy.

— 風の谷のナウシカ (1984)

昔は皆それをよーく知っておった

Back then, everyone knew that very well.

— 天気の子 (2019)