知っとった meaning of grammar?


What does the grammar form of 知るin the below sentence mean?

闇の世界とは関わるはずがないと知っとったんだろうな

The sentence is from the Japanese version of Harry Potter I




It's a contraction of 知っておった which is an archaic/dialectal version of 知っていた,
which means "knew".




It's a contraction of 知っておった which is an archaic/dialectal version of 知っていた,
which means "knew".

