Found an ancestor of mine from 12th century Scotland

[YoungDemCA]

On my maternal grandfather's side.

http://www.clanmacfarlanegenealogy.info/genealogy/TNGWebsite/getperson.php?personID=I4265&tree=CC

1 - William came to Scotland with King David I some time before 1128.

2 - Legend has it that the first Graham was one Gramus who forced a breach in the Roman Antonine wall known as Graeme's Dyke in 420 A.D. However, historians generally believe that the Grahams were of Norman descent. The first record of the name was William de Graham who received the lands of Aberdeen and Dalkeith from David 1 in 1127. From him descend all the Grahams of Montrose. They became numerous in Liddesdale and the Borders and later obtained lands in Strathearn and Lower Perthshi re, the area with which the clan is now associated. The main line of Graham chiefs were long and loyal supporters of the Scottish cause.

Another account of the clan...
The surname Graeme, or Graham, is said to be derived from the Gaelic word grumach, applied to a person of a stern countenance and manner. It may possibly, however, be connected with the British word grym, signifying strength, seen in grime's dyke, erroneously called Graham's dyke, the name popularly given to the wall of Antoninus, from an absurd fable of Fordun and Boece, that one Greme, traditionally said to have giverned Scotland during the minority of the fabulous Eugene the Second, broke through the mightly rampart erected by the Romans between the rivers Forth and Clyde. It is unfortunate for this fiction that the first authenticated person who bore the name in North Britain was Sir William de Graeme (the undoubted ancestor of the Dukes of Montrose and all "the gallant Grahams" in this country), who came to Scotland in the reign of David the First, from whom he received the lands of Abercorn and Dalkeith, and witnessed the charter of that monarch to the monks of the abbey of Holyrood in 1128. In Gaelic grim means war, battle. Anciently, the word Grimesdike was applied to trenches, roads and boundaries and was not confined to Scotland.