Roman Republic
- 50s BC: Present-day Jersey, populated by Celtic tribes, are conquered by the Roman Republic.
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Roman Empire
- 27 BC: Gaius Octavianus becomes sole ruler of Rome and as Augustus the first emperor.
- 395: After the death of emperor Theodosius I, the Roman Empire is partitioned in the (Eastern) Roman Empire and the (Western) Roman Empire. The region becomes part of the Western part of the Empire.
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- 400s: After the collapse of the Roman Empire, Jersey remains outside the Kingdom of the Franks. Celts from Britain settle in Brittany and the Channel Islands.
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Kingdom of Brittany
- c. 851: Erispoe becomes king of Brittany, established by Bretonic tribes.
- 800s/900s: Vikings invade and raid parts of Brittany.
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County of Normandy
- 933: Jersey is conquered by Normandy.
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| Duchy of Normandy
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Bailiwick of Jersey → England/Great Britain/United Kingdom
- 1259: England cedes its claim, except for Guernsey and Jersey. Jersey becomes a English (and later British) crown dependency.
- 16th century: The states of Jersey develop into a legislative body.
- 1771: The bailiff is confirmed as the chief power and president of the states. The states become the final legislative body.
- 19th century: The states develop into a parliament.
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- 1945: Jersey is liberated.
- 2005: After a reorganization the queen is represented by a lieutenant-governor. Jersey has a parliament elected in free elections on a universal suffrage, headed by the bailiff, and a chief-minister is responsible to the parliament.
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