"Genealogical and Heraldic Dictionary of the Peerages of England, Ireland, & Scotland, Extinct, Dormant, and In Abeyance"by John Burke, Esq, and John Bernard Burke, Esq, 2nd edition. MDCCCXL.page 759.
MACKENZIE - Earl of Seaforth.
This very ancient family deduced its descent from a member of the house of Gerald, in Ireland, (whence sprang the noble families of Leinster, Desmond, etc.,) who, with a considerable number of his followers, settled in Scotland about the year 1261, and having powerfully aided Alexander III., a few years afterwards, in repelling the invasion of Haco, King of Norway, was rewarded by a grant of the lands of Kintail, in the county of Ross, which were erected into a free barony by charter, dated 9th January, 1266.This personage,
CALINUS FITZGERALD, first feudal Baron of Kintail, m. a daughter of Walter, lord high steward of Scotland; and dying in 1278 was s. by his son, KENNETH, 2nd Baron of Kintail; who was s. in 1304, by his son,
KENNETH, third Baron of Kintail, who in the Gaelic was called Kenneth MacKenneth, which became corrupted in English into Mackenny, or Mackenzie, and hence arose all the families of Mackenzie in Scotland.
"Compota Thesaurariorum Regum Scotorum" Accounts of the Lord High Treasurer of Scotland vol. I.AD1473 - 1498. printed 1877.
Fol.7a. AD1473-4 "In primis componitur cum Dugallo Makdovele, Johanne Agnew et THOMA ADARE, pro morte quondam Thome Makdouell per ipsos facta ad septem annos; et pro omnibus etc., proditoria tradicione, murthro et communi furto exceptis : composicio, xxxII.
Item componitur cum NEVINO McKENZE ET NIGELLO ADARE pro morte quondam Thome McDovele et aliorum interfectorum apud Synons, commissa ad septem annos; et pro omnibus etc., proditoria tradicione, murthro et communi furto exceptis: composicio, xxII.
Item componitur cum Andrea Nelsone de Cragaffy pro furtiua destruccione bonorum JOHANNIS MURE tantum ; composicio, vII.
Item componitur cum ANDREA MACKYNQUHONALE pro precogitata felonia facta super JOHANNEM ADOUERE, et pro omnibus etc., proditoria tradicione, murthro, homicidio et communi furto exceptis ; composicio, iij II. vjs. viij d.