MOSTYN, JOHN, brother of Sir Thomas Mostyn, Bart. (adm. 1716, qv); b.; adm. (aged 13) Jun 1722; KS 1723; Capt. of the School 1727; elected head to Christ Church, Oxford 1728, matr. Jun 1728, Westminster Student 23 Dec 1728 – deprived 10 Dec 1734 (absence); Ensign, 16th Foot 29 Feb 1732; Capt., 6 Nov 1736; Capt. -Lieut., 2nd Foot Guards 2 Sep 1742; Capt. and Lieut. -Col., 2 Apr 1743; wounded at battle of Fontenoy 1745; Brevet Col. and ADC to George II 3 Dec 1747 (listed as ADC, Chamberlayne 1748); Col., 7th Foot (Royal Fusiliers) 26 Jan 1751 – Jul 1754, 13th Dragoons 8 Jul 1754 – Oct 1758; Maj. -Gen., 8 Jul 1757; Col., 5th Dragoons 18 Oct 1758 – Aug 1760; Lieut. -Gen., 8 Apr 1759; Col., 7th Dragoons 18 Aug 1760 – May 1763, 1st Dragoon Guards, from 13 May 1763; Gen., 25 May 1772; MP Malton 30 Dec 1741-68; Groom of the Bedchamber from 20 Jan 1746; Governor and Commander-in-Chief, Minorca, from 2 Mar 1768; defendant in 1773 in an action successfully brought by Anthony Fabrigas, who he had banished from the island (Howell, State Trials, xx, 81-238); d. 13 Feb 1779. DNB.