Setesh

'Seth was a rebel Goa'uld who lived secretly on Earth for thousands of years before he was discovered by SG-1. He was a fugitive from both the System Lords and the Tok'ra.

He created several cults throughout his time on Earth, impersonating the god Typhon in ancient Greece and leading a suicide cult in England during the eighteenth century. In the late twentieth century, he had a small group of followers and lived just north of Seattle.

SG-1 discovered him there and, after much difficulty, managed to kill him.