Stargate SG1 - Demons

Conflict makes for good TV. We get it. What would you do if you found a Stargate in the woods? These people being from medieval England/Europe doesn't make any sense. Chaucer IS Middle English, Daniel. Also, Shakespeare should be spoken with a US Southern accent. Why would the goa'uld ever give up the Unas as hosts? They seem awesome. But when exactly were these people taken from Earth? There's so much conflicting information in the episode to really make sense of.