The Wars of the Roses were one of the bloodiest periods in English history. After 30 years of conflict between the royal houses of Lancaster and York, the nobility was shattered, and the Plantagenet dynasty was ended. But what caused this long period of internecine violence? It's a story of such complexity and intrigue that it inspired one of the greatest TV smashes ever: Game of Thrones. Dan Snow narrates this animated short documentary on the events that led to 22 May 1455 - the First Battle of Saint Albans.