Écréhous

The islets, along with the other Channel Islands and the Cotentin Peninsula, were annexed to the Duchy of Normandy in 933. After William, Duke of Normandy conquered England in 1066 the islands remained united to the Duchy until the conquest of mainland Normandy in 1204 by Philip Augustus. In 1259 Henry III did homage to the French king for the Channel Islands. While Edward III in the 1360 Treaty of Brétigny waived his claims to the crown of France and to Normandy, he reserved various territories to England.

In 1203, shortly before the division of Normandy in 1204, John, Duke of Normandy granted the Ecrehos to the Abbey of Val-Richer that they might build a church there. The chapel measured 10 feet 3 inches (3.12 m) in width and 16 feet 6 inches (5.03 m) in length; the priory accommodation for the monks formed an extension to the chapel.[3] In 1309 it was reported that a prior was living in the Ecrehos with one monk and a servant; a navigation light was lit every night.[3]

In 1413 alien priories were suppressed, and the monks returned to Val-Richer. Their church and priory on La Maîtr'Île fell into ruins.[4]

In the 17th century the Ecrehos were used by smugglers. It was recorded that the main smuggled goods in the 1690s through the Ecrehos was lead and gunpowder destined for St Malô.[5]

In order to help control voting in Jersey, it was not unknown for citizens to find themselves taken and stranded on the Islands until after voting had taken place.[5]^:72

Though they are only inhabited sporadically by holidaymakers and fishermen, in the past there have been more permanent residents on the Ecrehos due to more abundant vegetation. Two eccentrics who lived on the Ecrehos for a long time proclaimed themselves to be Le Roi des Écréhous (The king of the Ecrehos) and claimed that sovereignty over the islands belonged to them. Philippe Pinel lived on Bliantch'Île from 1848 to 1898 and exchanged gifts with Queen Victoria. In the 1960s and 1970s Alphonse Le Gastelois found refuge in the islands from unfounded public suspicion of being the Beast of Jersey (a notorious sexual attacker of children who was later arrested, thus clearing Le Gastelois of suspicion).

In the 19th and early 20th centuries there were several occasions on which nominal control was displayed – e.g. flags and buoys, and there were several occasions on which the British government indicated to the French government that it wished to settle the matter.

In 1950 France took the United Kingdom to the International Court of Justice (ICJ) for discussions to decide to which country the Minquiers and Ecrehos belonged. The French fished in the waters, but Jersey exercised various administrative rights. In the Minquiers and Ecrehos case, the ICJ considered the historical evidence, and in its Judgment of 17 November 1953 awarded the islands to Jersey.[6]

La Marmotchiéthe is depicted on the 2010 issue Jersey 50 pound note.

In 2005, the States of Jersey designated it as an area under the Ramsar convention, signifying it was a wetland of international importance and giving it an enhanced status and recognition.[7] A management plan for the area has yet to be published. There was a public consultation in 2010 into Jersey's management of Ramsar areas but the results were not made public.