The regiment was formed in 1685 as The Queen’s Regiment of Horse, named in honour of Queen Mary, consort of King James II. It was renamed The King’s Own Regiment of Horse in 1714 in honour of George I. The regiment attained the title 1st The King’s Dragoon Guards in 1751.
The regiment served as horse cavalry until 1937 when it was mechanised with light tanks. The regiment became part of the Royal Armoured Corps in 1939.
The regiment merged with The Queen’s Bays (2nd Dragoon Guards) in 1959 to form the 1st The Queen’s Dragoon Guards