You can download this volume here - Electric Scotland

Chronicle of Lanercost 1
IN the same year the said Robert de Brus, King of Scotland, 2
came with a great army in the month of August to the
monastery of Lanercost, and remained there three days, making
many of the canons prisoners and doing an infinity of injury ;
but at last the canons were set at liberty by himself.
The said Earl [of Lancaster] entered Newcastle with a large
body of men-at-arms in order to seize the said Piers, according
to what had been ordained by the earls and barons;
. A D I 3 1 1
but it so happened that the king and he had gone to
Tynemouth, which is about six miles from Newcastle, and, hearing
that the earl was after them, they embarked in an open boat and
made for Scarborough, and were then received there. But the
king, having dismissed Piers there and Henry
de Beaumond
(likewise an alien) with some others for the defence of the castle,
left them and went to Knaresborough Castle, and thence forward
to York, thinking thereby to cause the siege of Scarborough to
be raised if the castle should be besieged ; but he failed to effect
what he wished. For the Earl of Lancaster, hearing that the
king and Piers had separated, and that Piers was in the castle,
attacked it most vigorously, so that very shortly Piers was
forced to surrender himself. This, however, he did upon terms
which, as I have not heard them, I have not written. Having
surrendered, he was committed to the custody of Sir Aymer de
Valence, Earl of Pembroke, who had ever before been his chief
enemy, and about the feast of the nativity of John the Baptist, 3
in the absence of Aymer de Valence, he was beheaded on the
1 See Scottish Historical Review, vi. 13, 174, 281, 383 ; vii. 56, 1 60, 271, 377 ;
viii. 22, 159, 276.
2 This is the first time the chronicler admits King Robert's regal rank. But
neither he nor any of his successors ever called themselves King of Scotland ; they
were Kings of Scots.
3 24th June. The actual date of decollation was igth June.