Hobbitmum, The 4th Light Dragoons (now the 4th Queen's Own Hussars)were originally raised as a regiment of six troops of Dragoons in Wessex in 1685 by the Honourable John Berkeley, as part of Parliament's reaction to the Monmouth Rebellion. Berkeley married Barbara Villiers, a friend of King's younger daughter, Anne. The regiment was then known as "The Princess Anne of Denmark's Regiment of Dragoons." (How do you fancy answering the phone for that lot?) The regiment fought for the crown during the Glorious Revolution, then switched to support William of Orange in 1688. They fought their first action in Scotland against royalists in 1689. They were commanded by Colonel Fitzhardinge in 1690, and the Princess title was dropped.

The regimental history is at

http://www.qrh.org.uk/history4a.htm