Which knight and military leader was sentenced to death by King Edward II of England for his unauthorized truce with his rebellious northern kingdom, but only three months later had to conclude a thirteen-year truce with the Scottish rebels?

In 1321 he was summoned to parliament as a baron. The next year he gathered and led the northern forces that defeated and captured Thomas, Earl of Lancaster at Boroughbridge. On 25 March, just three days after Lancaster's execution, Harclay was created Earl of Carlisle, being girded with the comital sword by King Edward II himself. In addition he was promised land grants suitable for that rank.

The defeat of the rebels enabled the king to turn his attention to Scotland. Harclay raised another considerable force towards this campaign, but was unable to meet up with the royal forces before their disastrous defeat at Old Byland.

Afterwards the north of England became very hard to defend against Scottish raiding, and apparently Harclay decided to take matters into his own hands, and met with Robert I of Scotland to propose peace terms. Several different versions of the resulting agreement are extant, which has led to a lack of consensus amongst historians regarding the reasonableness of the proposal.

In any case King Edward could deem it nothing less than treason. Harclay was arrested, and hanged, drawn and quartered on 3 March 1323.