Law of Guernsey and yet another in 1338 resulted in both the improved training of the militia and a Royal Charter of 1341 confirming the Islands' constitution, this Charter being ratified by successive sovereigns. The ratification by Elizabeth I of 1560 set out in detail the rights of the Bailiwick of Guernsey. A seal granted to the Channel Islands in 1279 and to each of Guernsey and Jersey in 1304 have become symbols of Guernsey's separate identity from both Jersey and the United Kingdom. The customary law of the Duchy of Normandy is particularly influential as a source of law. Norman law developed
Law of Guernsey relating to rubbish collection and data protection laws. Certain laws affecting Guernsey can be imposed on Guernsey by the United Kingdom government and are registered as Guernsey laws to extend them to the Bailiwick. Examples include the Landmines Act 1998 ( becoming the Landmines Act 1998 (Guernsey) Order 2000) and the Police Act 1997. There have been many cases in history of Guernsey simply not registering Parliamentary laws which has the effect of nullifying them. Convention requires Parliamentary laws to (a) not go beyond the prerogative powers over the Islands and (b) should be consonant with aspects of modern law.