In September 1668 the Prince was made Constable of Windsor, in November he was granted the keepership of the Park, and in 1670 he became Lord Lieutenant of Berkshire. From that time he lived much at Windsor, but we find him still occasionally employed in the public service. At the request of the Mayor and Aldermen of London he laid the first stone of a new pillar of the Exchange.[25] In 1669 he was on the Committee for Foreign Affairs; and in 1670 he was authorised to conclude a commercial treaty with the French Minister, Colbert.[26] In 1671 he was one of the commission appointed to consider the settlement of Ireland; and in 1679 various "odd letters and superscriptions" taken on a suspected Frenchman, were handed over for the Prince to decipher.[27] But after the last naval action of 1673 Rupert retired more and more from public life. The peacefulness of Windsor suited him far better than the turmoil of the court, and he devoted himself to the repairing and embellishing of the castle, in which he took an "extraordinary delight."[28] Evelyn, who visited Windsor in 1670, describes the castle as exceedingly "ragged and ruinous," but Rupert had already begun to repair the Round Tower, and Evelyn was lost in admiration of the Prince's ingenious adornment of his rooms. The hall and staircase he had decorated entirely with trophies of war,--pikes, muskets, pistols, bandeliers, holsters, drums, pieces of armour, all new and bright were arranged about the walls in festoons, giving a very curious effect. From this martial hall Evelyn passed into Rupert's bedroom, and was immensely struck with the sudden contrast; for there the walls were hung with beautiful tapestry, and with "curious and effeminate pictures," all suggestion of war being carefully avoided. Thus successfully had Rupert {340} represented the two sides,--martial and artistic,--of his nature.[29] At this time he devoted himself more closely than ever to his scientific and mechanical studies, "not disdaining the most sooty and unpleasant labour of the meanest mechanic."[30] In such harmless and intelligent pursuits did he find his pleasures. He was not a person of extravagant tastes, which was fortunate, seeing that his means were not large, and that his purse was always open to the needy, so that he had no great margin for personal expenditure. From his trading ventures he doubtless derived some profits; and in 1660 he had been assigned a pension of L4,000 per annum. For his naval services he received no wages, but occasional sums of money offered as the King's "free gift."[31] As Constable of Windsor he had perquisites, and when he chose to live at Whitehall, an allowance of food was given him, at the rate of six dishes per meal.[32] But, after his appointment to Windsor, he was seldom seen at Whitehall, except when it was necessary to attend some State funeral, at which functions he was generally required to play the part of chief mourner.