The Battle of Stoke Field on 16 June 1487 may be considered the last battle of the Wars of the Roses, since it was the last major engagement between contenders for the throne whose claims derived from descent from the houses of Lancaster and York respectively. The Battle of Bosworth, two years previously, had established King Henry VII on the throne, ending the last period of Yorkist rule and initiating that of the Tudors. The Battle of Stoke Field was the decisive engagement in an attempt by leading Yorkists to unseat him in favour of the pretender Lambert Simnel.