Bailiwick of Guernsey history of the Bailiwick of Guernsey goes back to 933, when the islands came under the control of William Longsword, having been annexed from the Duchy of Brittany by the Duchy of Normandy. The island of Guernsey and the other Channel Islands formed part of the lands of William the Conqueror. In 1204 France conquered mainland Normandy – but not the offshore islands of the bailiwick. The islands represent the last remnants of the medieval Duchy of Normandy. Initially there was one governor, or co-governors working together, of the islands making up the Channel Islands. The title "Governor" has changed
Postage stamps and postal history of Guernsey the 1950s Guernsey used British regional stamps marked specifically for use in Guernsey but valid for postage throughout the United Kingdom. Guernsey has issued its own stamps since the creation of Guernsey Post, 1 October 1969. The Bailiwick of Guernsey incorporates Alderney, Herm and Sark which all used the Guernsey issues from 1969. From 1983 Guernsey began issuing specific stamps designated Alderney for use in that island which are also valid throughout the Bailiwick of Guernsey.. In 1998 postage stamps were issued without a price stated on the stamp, the terms "Local" and "UK" being used to distinguish the values.