The history of Guernsey stretches back with evidence of Neolithic occupation, followed by Roman occupation. Christianity was brought to Guernsey by St Sampson.
The islands were annexed by the Duchy of Normandy and were ruled separately by William the Conqueror even after becoming King of England. Over the centuries the islands experienced trade benefits and restrictions with attacks by pirates and naval forces leading to improvements in fortifications and the establishment of the Guernsey militia. Guernsey has remained loyal to the English Crown for over 1,000 years.
During the English Civil War, Guernsey supported the Parliamentarians, whilst Castle Cornet sided with the Royalists. The Napoleonic Wars brought prosperity through privateering and maritime trade, with a later rise of the stone industry, quarrying, horticulture, and tourism. The language in common use began to change from Guernésiais to English.
The islands were occupied by German troops in World War II, with the Islanders later rebuilding their lives through tourism, agriculture, trade and more recently, the finance industry.