At the early age of twelve, he received King Charles I on a visit to Seton Palace, delivering himself of a Latin oration at the iron gates of the palace in the presence of His Majesty. There and then the King conferred upon him the honour of knighthood, remarking as he did so: "Now, Sir Alexander, see that this does not spoil your school; by the appearance you will be a scholar."
Excommunication
After extensive travels in foreign lands Sir Alexander came home in 1640. But, refusing to sign the Covenant in 1643, he was excommunicated in Tranent Church, and had to flee to France.
Cavalier
Upon returning he was entrusted with important State business by King Charles II, who created him Viscount of Kingston on 14 February 1651 with limitation to the heirs male of his body. His title was taken from a village of that name in Dirleton parish, about two miles south-west of North Berwick. On the day of his creation, Sir Alexander was, with a gallant little garrison, defending Tantallon Castle against Oliver Cromwell who had laid siege to it. Following twelve days and a "battering with grate canon" the defenders were compelled to surrender, but only after quarter had been granted to them in recognition of their bravery.
In 1668 Lord Kingston was appointed, by the King, commander of the Haddingtonshire Militia.
Marriages
Lord Kingston married four times.
Firstly to Jean Fletcher (d. August 1651), only daughter of Sir George Fletcher, Gentleman of the Privy Chamber in Ordinary to King Charles I, and brother of Sir Andrew Fletcher of Saltoun, a senator of the College of Justice, and had issue:
Kingston married secondly Elizabeth Douglas (30 May 1632, Stoneypath Tower, near Garvald, - Wednesday 21 October 1668, Whittingehame) sister and heir of Archibald Douglas of Whittingehame, and had issue:
