The eldest of Simon's five sons was the famous SIR GEORGE MACKENZIE of Rosehaugh, Lord Advocate for Scotland, whose history is so well known that it would serve no good purpose to give only such a brief account of it as could be given in the space here available. He wrote several works of admitted literary merit, his "Institutes" being to this day considered a standard legal authority. He left an autobiography in MS. which was published by his widow in 1716. The estate of Rosehaugh, where he always took up his residence while in the Highlands, was, in his time, profusely covered with the Dog Rose, a fact which first suggested to the famous lawyer the idea of designating that property by the name of "Vallis Rosarum," or Rosehaugh. Sir George married first, Elizabeth, daughter of John Dickson of Hartree, with issue - (1) John; (2) Simon; (3) George, all of whom died young and unmarried; (4) Agnes, who in 1705 married Sir James Stuart Mackenzie, first Earl of Bute, with issue, whose descendants, now represented by the Earl of Wharncliffe, succeeded to his Ross-shire estates, but since sold by them, though still retaining the name and arms of the family. (For the succession see Retour of James Marquis of Bute, January, 1721); (5) Elizabeth, who married, first, Sir Archibald Cockburn of Langton, with issue, and, secondly, the Hon. Sir James Mackenzie of Royston, Baronet, with issue - George (who married but died before his father, without male issue), and two daughters - Anne, who married Sir William Dick of Prestonfield; and Elizabeth, who married Sir John Stuart of Grandtully, with issue. Sir George Mackenzie of Rosehaugh married, secondly, Margaret, daughter of Haliburton of Pitcur, with issue, (6) James, who died young; (7) George, who succeeded his father as II. of Rosehaugh, and married - with issue, an only daughter, who died without issue; (8) Jean, and (9) Margaret, both of whom died without issue. From this it will be seen that the male representation of Sir George Mackenzie of Rosehaugh, eldest son of the Hon. Simon Mackenzie of Lochslinn, terminated at the death of his only son. We must therefore revert to SIMON MACKENZIE, the immediate younger brother of Sir George Mackenzie, and second son of the Hon. Simon Mackenzie of Lochslinn, from whom JAMES FOWLER MACKENZIE OF ALLANGRANGE, present Chief of the Clan, is descended as follows: SIMON, who died at Lochbroom in 1664, married Jane, daughter of Alexander Mackenzie, I. of Ballone, brother of Sir John Mackenzie of Tarbat and uncle to George, first Earl of Cromarty (marriage contract 1663) with issue - an only and posthumous son,