The rule of Isabella and Mortimer did not last long after the announcement of Edward's death. They made peace with the Scots in the Treaty of Northampton, but this move was highly unpopular. Isabella and Mortimer both amassed, and spent, great wealth, and criticism of them mounted. Relations between Mortimer and Edward III became strained and in 1330 the king conducted a "coup d'état" at Nottingham Castle. He arrested Mortimer and then executed him on fourteen charges of treason, including the murder of Edward II. Edward III's government sought to blame Mortimer for all of the recent problems, effectively politically rehabilitating Edward II. Edward III spared Isabella, giving her a generous allowance, and she soon returned to public life.