John dies in 1216 with the country in civil war and in danger of being conquered by France. Worse still, the new king, Henry III, is only 9 years old and in his minority. Thankfully, he has a medieval hero in William Marshal to fight his battles, but when he comes to rule by himself he finds ruling the country a tricky business, not least because his nobles are still insisting on having more of a say in the sharing of power. The conflict with Simon de Montfort sees the birth of Parliament and threatens to make England a republic. Can Henry hold on to power and will this be enough for him to win the Rex Factor?