The 7th Dragoon Guards was a cavalry regiment

Cavalry regiments of the British Army

There are currently nine regular cavalry regiments of the British Army, with two tank regiments provided by the Royal Tank Regiment, traditionally classed alongside the cavalry, for a total of eleven regiments. Of these, five serve as armoured regiments, and five as formation reconnaissance...

 in the British Army

British Army

The British Army is the land warfare branch of Her Majesty's Armed Forces in the United Kingdom. It came into being with the unification of the Kingdom of England and Scotland into the Kingdom of Great Britain in 1707. The new British Army incorporated Regiments that had already existed in England...

, first raised in 1688. It saw service for three centuries, before being amalgamated into the 4th/7th Dragoon Guards in 1922.

The regiment was first raised as Lord Cavendish's Regiment of Horse in 1685, by the regimenting of various independent troops, and ranked as the 9th and later 8th Regiment of Horse. In 1746 it was transferred to the Irish establishment, where it was ranked as the 4th Regiment of Horse, or the "Black Horse", and transferred back to the British establishment in 1788 as the 7th (The Princess Royal's) Dragoon Guards for Princess Charlotte

Charlotte, Princess Royal

The Princess Charlotte, Princess Royal was a member of the British Royal Family, the eldest daughter of George III. She was later the Queen Consort of Frederick of Württemberg...

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After service in the First World War, it retitled as the 7th Dragoon Guards (Princess Royal's) in 1921, and was amalgamated with the 4th Royal Irish Dragoon Guards

4th Royal Irish Dragoon Guards

The 4th Royal Irish Dragoon Guards was a cavalry regiment in the British Army, first raised in 1685. It saw service for three centuries, before being amalgamated into the 4th/7th Dragoon Guards in 1922....

, to form the 4th/7th Dragoon Guards the following year.