User blog comment:LokiIsAwesome/Agravaine and a few other Series 4 characters.../@comment-5350801-20120815231736

Until I read this all, I am going to say this: Agravaine was there to seek revenge on Uther because of his sister. I think when Arthur sent for him he saw his chance. What boggles me is if he was trying to make Uther suffer for what happened, why continue tormenting Arthur. Arthur didn't ask to be born from magic. It's not his fault. Once Uther died, Agravaine should have left it at that.

All I can think of is he was in love with Morgana and he was under her "spell." Everyone does crazy things when they are in love.