 After the Battle of Mortimer's Cross, the future King Edward IV of England marched and took the capital from the Lancastrians.Parliament voted an attainder on his opposition, and John declared a traitor.The effect of the attainder was to terminate the Barony of Okehampton (creation 1299), so that the Earldom inherited from the Redvers family was in abeyance, passing laterally to the descendants of Courtenay's sisters  The new King, Edward IV, marched north and sealed his reign with the bloody victory at the Battle of Towton, following which his brother was beheaded.