James Johnston (British Army officer, born 1721)

Among his maternal family were aunts Frances, Countess of Rosse (and, later, Viscountess Jocelyn), Mary (née Claxton) Carter.

[3] Desperately wounded at the battle of Minden in 1759[4] he was promoted to full colonel of Horse, Royal Horse Guards 9 March 1762,[5] (the same day as his 'Irish' cousin was gazetted colonel of Dragoons)[note 2] and appointed an aide-de-camp to King George III.

[7][9] On 2 April 1778 he was removed from his colonelcy of Royal Horse Guards[10] and a fortnight later appointed colonel of the 6th Regiment of Dragoons.

[11] In succession to George Preston, his sister's husband, he was made colonel of the Scots Greys on 4 February 1785, a post he held until his death.

Before her death during childbirth on 28 April 1762,[14] Charlotte and James were the parents of least three sons and three daughters, including:[15] Johnston then married his cousin Frances (née Carter) Twysden.