I actually really like Rollo despite his one dimension character. Hopefully he will stick by Ragnar even with what happened the last episode. Ragnar turned into a bit of a dick the last two episodes even though I understand that they had to somehow bring in his new sons somehow. The legends are as much about Ragnar's sons as they are about himself.
I was really surprised that they have already shown the snake pit. Makes me wonder if Ragnar will survive the second season even though I think the second season is going to focus on France.