On 09 Feb 1281 King John I of Scotland (age 32) and Isabella Warenne were married. She the daughter of John Warenne 6th Earl of Surrey (age 50) and Alice Lusignan Countess of Surrey. They were fourth cousins. He a great x 5 grandson of King Henry I "Beauclerc" England.

On 30 Nov 1292 King John I of Scotland (age 43) was crowned I King Scotland.

On 27 Apr 1296 Battle of Dunbar was fought between [his father-in-law] John Warenne 6th Earl of Surrey (age 65) and King John I of Scotland (age 47), his son in law. John Strathbogie 9th Earl Atholl (age 30) and John Comyn 3rd Earl Buchan were captured. The English routed the disorganised Scots in a single charge. Few died; many were captured.

John of Fordun's Chronicle of the Scottish Nation Book 4 Chapter 107. On the 27th of July 1302, [Note. The date here confusing since the Battle of Roslyn is reported to have taken place on 24 Feb 1303] took place the great and famous engagement between the Scots and English, at Roslyn [Map], where the English were defeated, though with great difficulty. From the beginning of the first war which ever broke out between the Scots and English, it is said, there never was so desperate a struggle, or one in which the stoutness of knightly prowess shone forth so brightly. The commander and leader in this struggle was John Comyn (age 33), the son. Now this was how this struggle came about, and the manner thereof. After the battle fought at Falkirk, the king of England (age 63) came not in person, for the nonce, this side of the water of Forth; but sent a good large force, which plundered the whole land of Fife, with all the lands lying near the town of Perth [Map], after having killed a great many of the dwellers in those lands. On the return of this force, with countless spoils, that king hied him home again with his host. Now this was brought about, doubtless, by God's agency: for had he made a lengthened stay then, or after the battle of Dunbar and the seizure of King John (age 53), he would either have subjugated the whole land of Scotland, and the dwellers therein, to his sway, or made it a waste with naught but floods and stones. But the goodness of God, Who alone tends and heals after wounds, so governed the actions and time of that king, that, being stirred up to battle, and engrossed with sundry wars, he could not put off all other matters, and give himself up to subduing this kingdom. So that king of England went back with his men, having first appointed the officers of the sheriffdoms, and the wardens of the castles, in the districts beyond the water of Forth, which were then fully and wholly subject unto his sway - with the exception of a few outlaws (or, indeed, robbers), of Scottish birth, who were lurking in the woods, and could not, because of their misdeeds, submit to the laws. But John Comyn, then guardian of Scotland, and Simon Eraser, with their followers, day and night did their best to harass and annoy, by their great prowess, the aforesaid king's officers and bailiffs; and from the time of that king's departure, for four years and more, the English and the Anglicized Scots were harried by them, in manifold ways, by mutual slaughter and carnage, according to the issue of various wars.