Same-sex marriage in Guernsey changes to other laws are approved by the States at its meeting on 26 April. On 26 April, the States approved both ordinances, and the law took effect on 2 May 2017. It applies to the jurisdiction of Guernsey, but not to Alderney and Sark. Alderney, one of the three constituent Channel Islands which form the Bailiwick of Guernsey, has full autonomy in most legal matters (except foreign affairs and other powers that have been transferred to the States of Guernsey), through the States of Alderney. Same-sex marriage is legal in Alderney. On 21 February 2017, the States of Alderney's
Bailiwick of Guernsey was introduced above the "fiefs" and below the "Eschequier" Court in Rouen and comprised the Bailiff and four Knights; the court heard appeals and tried criminal cases. Otton de Grandson, then the Governor of the Islands, delegated the civil powers to two separate bailiffs for Guernsey and Jersey before he went on the Second Crusade to the Holy Land in 1290. This can be assessed as the date of first creation of the two Bailiwicks. Situated around , Alderney, Guernsey, Herm, Sark, and some other smaller islands together have a total area of and coastlines of about . Elevation varies