But Malcolm was never destined to fulfil the high promise of his youthful career, the delicacy of constitution, bequeathed by Queen Margaret to so many of her descendants, early developing itself in her grandson’s eldest child. [Sidenote: A. D. 1163.] Three years after the conquest of Galloway, during his progress towards the south, he was overtaken by a dangerous illness at Doncaster; though his days were not yet numbered, and he recovered sufficiently to carry out the original purpose of his visit to England, concluding an alliance with Henry that promised to ensure a firm and lasting peace.[391] He is also stated to have been present shortly afterwards at Woodstock, to tender his homage to the younger Henry, as his grandfather had done to the empress-queen, with the usual reservation of fealty to the elder king.[392] [Sidenote: A. D. 1164.] One more triumph was in store to grace the closing years of his career. Within a year or two of the liberation of Malcolm Mac Heth from Roxburgh Castle, the lord of the Oirir-Gael appears to have made his peace with the king of Scotland; though for some unknown cause, in the year 1164, he again broke out into open rebellion, landing suddenly on the coast of Renfrew with the whole force of Argyle and the Isles, strengthened by a body of auxiliaries from Ireland. Hardly had he set foot on shore before he fell, with his son Gillecolum--tradition says by treachery--and his followers dispersing, as usual, upon the death of their leader, returned at once to their island homes. Thus perished, in an obscure skirmish, the mightiest and most formidable of Malcolm’s enemies; the chieftain who raised the power of the Lords of Argyle upon the ruins of the ancient kingdom of the Gall-Gael.[393]