"And upone Monday thereftir being the xx of Maij, he was callit in befoir the Estaites than sitting in Parliament, quhair he resaved the sentence of death; to be hangit the morne thaireftir, at the mercat croce of Edinburgh, at twa eftir nune, thair to hing for the space of thrie houris thaireftir upone the gallows, and thaireftir to be tane doun and to be heidit and quarterit; his heid to be hung up upone the tolbuith of Edinburgh, his twa leggis and airmes to be sent to four severall tounes, viz. to Glasgow, Sterling, Pearth, and Abbirdene. This sentence wes punctuallie execute upone him at the mercat croce of Edinburgh upone Tysday thaireftir, being the 21 day of Maij 1650, and he hangit upone ane heigh gallows, maid for the view of the pepill more then ordinar, with his buikis and declaratiounes bund on his bak. He hang full thrie houris ; thaireftir cut doun, falling upone his face, nane to countinance him bot the executioner and his men. His heid, twa leggis, and twa airmes tane fra his body with ane aix, and sent away and affixt at the places foirsaidis appoyntit thairfoir; his body eaffin in to ane lytill schoirt kist, and takin to the Burrow mure of Edinburgh, and bureyed thair among malefactouris." -- John Nicoll, A Diary Of Public Transactions And Other Occurrences, chiefly in Scotland, from January, 1650, to June, 1667
[And upon Monday thereafter, being the xx of May, he was called in before the Estates then sitting in Parliament, where he received the sentence of death; to be hangit the morn thereafter upon the gallows, and thereafter to be taken down and to be headed and quartered; his heid to be hung up upon the Tolbooth of Edinburgh, his two legs and arms to be sent to four several towns, viz., to Glasgow, Stirling, Perth and Aberdeen. This sentence was punctually execute upon him at the mercat cross of Edinburgh on Tuesday thereafter, being the xxi day of May, 1650, and he hangit upon a high gallows, made for the view of the people more than ordinar, with his books and declarations bound on his back. He hang full three hours; thereafter cut doun, falling upon his face, nane to countenance him but the executioner and his men. His heid, twa leggis, and twa arms, taken from his body with an axe, and sent away and affixt at the places foresaids appointed therefor; his body cast into a little short kist, and taken to the Borough-muir of Edinburgh, and buried there among malefactors.]
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"He either fears his fate too much,
Or his deserts are small,
That dares not put it to the touch,
To gain or lose it all."
(lines written by James Graham
when earl of Montrose)
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For a description of his disinterment after the Restoration see
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NT2573 : Marquis of Argyll effigy, St. Giles