Well, Cecil_XIX was the second person to join, and he's missed out on a lot of KotR, so I thought that he deserves to have William.

Both you and gibbonsong also could have had the post, but sadly three people can't play one person. But you'll have Henry, who if he plays his cards correctly could become king like he did in history.

Initial avatar assignment:
King William the Conqueror - Cecil_XIX
Prince Rufus - Ignoramus
Robert - ?

Currently we have no one for the Curthose family. Warluster is the first baron of the Rufus family, and should get Rufus' first son. Ichigo will get Henry as soon as he comes of age.