 These were the years during which most of the peel towers and warning beacons were built, around the Lake District dome, chiefly in the Eden Valley, the Solway plain, the West Cumberland plain and the Kent valley.The Wars of the Roses, fought between Lancastrian and Yorkist claimants to the throne of England, had some cause and effect in Cumbria, although no battle took place there.The intense rivalry between the landowners in Cumbria and elsewhere in the North fed into the factionalism at Court which was exacerbated by the mental instability of King Henry VI of England.