Major William Mackenzie, who died on the 12th of March, 1770. He married Mary, daughter and co-heir of Matthew Humberston, Lincoln, with issue, two sons - (1) Thomas Frederick Mackenzie, Colonel of the 100th Regiment of foot, who assumed the name of Humberston in addition to his own on succeeding to his mother's property; and (2) Francis Humberston Mackenzie. Both of Major William's sons ultimately succeeded to the Seaforth estates. He had also four daughters - (1) Frances Cerjat, who married Sir Vicary Gibbs, M.P., his Majesty's Attorney-General, with issue; (2) Maria Rebecca, who married Alexander Mackenzie of Breda, younger son of James Mackenzie, III. of Highfield, with issue, six sons - William, a Lieutenant in the 78th Highlanders, who died at Breda, in Holland, from a wound which he received on the previous day at the taking of Merxein, in 1814 Thomas, a Midshipman, R.N., drowned at sea; Frederick, R.N., murdered at Calcutta in 1820; Francis, R.N., drowned at sea in 1828; and Colin, all without issue; also Captain Alexander, of the 25th Regiment, subsequently Adjutant of the Ross-shire Militia, who married Lilias Dunbar, daughter of James Fowler of Raddery, with issue - James Evan Fowler, who died unmarried; Alexander, now residing at Fortrose, and three daughters who died unmarried; (3) Elizabeth, who died without issue; and (4) Helen, who married Major-General Alexander Mackenzie-Fraser of Inverallochy, fourth son of Colin Mackenzie, VI. of Kilcoy, Colonel of the 78th Regiment, and M.P. for the County of Ross, with issue. Major William died on the 12th of March, 1770, at Stafford, Lincolnshire. His wife died on the 19th of February, 1813, at Hartley, Herts. His eldest son, Colonel Thomas Frederick Mackenzie-Humberston, it will be seen, thus became male heir to his cousin, Earl Kenneth, who died, without male issue, in 1781. The Earl, finding his property heavily encumbered with debts from which he could not extricate himself, conveyed the estates to his cousin and heir male, Colonel Thomas, in 1779, on payment of L100,000. Earl Kenneth died, as already stated, in 1781, and was succeeded by his cousin, XX. COLONEL THOMAS FREDERICK MACKENZIE-HUMBERSTON, In all his estates, and in the command of the 78th Ross-shire Highland Regiment, but not in the titles and dignities, which terminated with his predecessor. When the 78th was raised, in 1778, Thomas Frederick Mackenzie-Humberston was a captain in the 1st Regiment of Dragoon Guards, but he gave this up and accepted a captaincy in Seaforth's regiment of Ross-shire Highlanders. He was afterwards quartered with the latter in Jersey, and took a prominent share in repelling the attack made on that island by the French. On the 2nd of September, 1780, he was appointed from the 78th as Lieutenant-Colonel-Commandant of the 100th Foot.