Wikipedia
Royal Coachman
The Royal Coachman is an artificial fly that has been tied as a wet fly, dry fly and streamer pattern. Today, the Royal Coachman and its variations are tied mostly as dry flies and fished floating on the water surface. It is a popular and widely used pattern for freshwater game fish, particularly trout and grayling. Large streamer versions are also used for winter steelhead and Atlantic salmon.
In Royal Coachman—The Lore and Legends of Fly-Fishing (1999) Paul Schullery describes the Royal Coachman: