One person would be Lemmy, watch the documentary or read the book. Truly lovely bloke.
With apostles of Ozzy, Dio, Steve Harris, and Rob Halford.
I met Alexi Laiho once, he made manowar look like a nu metal band
I'm surprised no one has mentioned the kinks. With their song "you really got me" I'm pretty sure that was considered the first heavy metal song with Dave Davies famous guitar rift.
They may not be considered the fathers or gods of Rock and roll or heavy metal but they must surely make the list.