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. Guernsey becomes part of the Western part of the Empire.
400s: After the collpase of the Roman Empire, Guernsey remains outside the Kingdom of the Franks. Celts from Britain settle in Brittany and the Channel Islands.
1259: England cedes its claim, except for Guernsey and Jersey. Guernsey becomes a English crown dependency.
1835: Guernsey gets a lieutenant-governor, who appoints a bailiff. Out of the practice to consult notables, a states of deliberation evolves. This becomes gradually a parliament.
2004: After the reorganization the queen is represented by a lieutenant-governor. The island has a parliament elected in free elections on a universal suffrage, headed by the bailiff, and a chief minister is responsible to the parliament. Laurie Morgan becomes the first chief minister.