The Plantation of Ulster (; Ulster-Scots: Plantin o Ulstèr) was the organised colonisation (plantation) of Ulstera province of Irelandby people from Great Britain during the reign of King James I. Most of the colonists came from Scotland and England. Small private plantation by wealthy landowners began in 1606, while the official plantation began in 1609. An estimated half a million acres (2,000 km²) spanning counties Tyrconnell, Tyrone, Fermanagh, Cavan, Coleraine and Armagh, was confiscated from Gaelic chiefs, most of whom had fled Ireland in the 1607 Flight of the Earls. Most of counties Antrim and Down were privately colonised. Colonising Ulster with loyal settlers was seen as a way to prevent further rebellion, as it had been the region most resistant to English control during the preceding century.