This officer served under his brother, Captain Thomas Langston, who commanded a troop of horse at Tangier in Africa, and signalized himself against the Moors. When the troops of Tangier Horse were constituted Royal Dragoons, in 1683, FRANCIS LANGSTON obtained a commission in that corps, and he served in the Royal Regiment of Dragoons until December, 1688, when the Prince of Orange promoted him to the Lieutenant-Colonelcy of the Eighth, or Princess Anne's Regiment of Horse, of which his brother was appointed Colonel. He proceeded with his regiment to Ireland in the same year; and his brother Thomas dying in that country, he was appointed to succeed him in the Colonelcy of the Eighth Horse. He served at the head of his regiment at the battles of the Boyne and Aghrim, and in numerous skirmishes, until the final reduction of Ireland under the dominion of William III. His services were immediately afterwards transferred to the Netherlands; and his regiment having suffered severely, from having been long exposed to a furious cannonade at the battle of Steenkirk, it was disbanded, and Colonel Langston was appointed to the command of the FIFTH HORSE, now FOURTH DRAGOON GUARDS. At the battle of _Landen_ this officer highly distinguished himself at the head of the right squadron of his regiment, and was wounded and taken prisoner. He was promoted to the rank of Brigadier-General on the 1st of June, 1697; and proceeding, after the peace of Ryswick, with his regiment to Ireland, he was placed on the staff of the army in that country. During the wars in the reign of Queen Anne this officer was not employed on foreign service, but was continued on the staff of Ireland. He was promoted to the rank of Major-General on the 1st of June, 1703, and to that of Lieutenant-General on the 1st of June, 1704. When the great Duke of Marlborough was removed from his military commands, Lieutenant-General Langston appears to have been considered too firmly devoted to the protestant cause, and to the succession of the House of Hanover, for the new ministry to confide in him, and he retired from the army. This veteran died on the 6th of April, 1723. GEORGE JOCELYN. _Appointed 20th October, 1713._