Council, and a Commissioner of the Treasury, in the reign of William III and Queen Anne. He was appointed in 1706 as one of the Commissioners for Scotland for the Treaty of Union. Francis acquired the estate of Hessilhead and built an addition to the old tower as well as slating the roof, making it one of the finest properties in the district on behalf of his eldest son, Lieut.-Colonel John Montgomerie of Giffen, whilst continuing to live at Giffen for the remainder of his life. Henry married a granddaughter of Alexander Leslie, Earl of Leven the favourite General of Gustavus Adolphus, King of Sweden. She died in her prime and a certain highly valuable jewel, given to her grandfather by the Swedish king and which was to be passed only through her family came into the possession of Henry. The 6th Earl of Leven instigated legal proceedings which eventually saw the jewel returned to the Leslie family. In 1697 Francis was made one of the commissioners looking into witchcraft following the Christian Shaw case. Five out of 24 accused persons were burned at the stake. The Act of Union was very unpopular in some quarters. A song of 1706 on the Union reads:- In another, called "Lines upon the Rogues in Parliament", is the following stanza:- Upon the death in October 1709 of George Allardyce, Master of the Scottish Mint, John was appointed to the post. He went on to become the MP for Ayr at the 1710 General election, and became one of the Gentleman of the bedchamber to George II, when Prince of Wales. John Montgomerie seems to have been totally uninterested in the affairs of the mint and his personal finances were in some disarray. He at one point proposed an exchange of his post at the mint for a commission in the Foot Guards and ended up with both. He fought in the war against France and was at the disastrous battle of Almanza in Spain. In June 1717 he assigned his salary to a third party, having withdrawn from any active involvement. In 1727 he was appointed as Governor of New York, where he remained until his death on 1 July 1731. He had a daughter Elizabeth, and upon his death the line of the Montgomerie of Giffen became extinct. He had been forced to sell his estates and it was Sir John Anstruther