After the Nine Years War and the departure of the earls of Tyrone and Tyrconnell in 1607, the Crown declared their lands forfeit and organised the systematic settlement of six Ulster counties. Grants to English and Scottish undertakers carried an obligation to plant British Protestant tenants and, on most estates, to remove the existing Irish occupiers to land set aside for them, a condition that was widely evaded because settlers were scarce and Irish tenants paid higher rents. Alongside the official scheme, private plantation in Antrim and Down brought in large numbers of Lowland Scots. The result was not a clearance but a layered settlement in which a substantial British Protestant population was established over a dispossessed Gaelic landowning class and a partly displaced tenantry, a configuration that shaped the 1641 rising and Ulster's subsequent history. Contemporary records document land transfers and settler musters far better than they document the movement of the displaced.
The English Crown confiscated the lands of the Gaelic lords of Ulster after their flight and granted them to English and Scottish settlers, requiring the removal of the Irish tenantry from most of the granted land
No census exists. Ireland's population around 1600 is generally reconstructed at roughly 1.4 million from later hearth-money returns worked backwards, with Ulster the least populous and most war-devastated province after the Nine Years' War; estimates for Ulster cluster around 150,000-250,000. By 1641 the planted British population of Ulster is estimated at about 40,000.
The plantation itself was not accompanied by mass killing. Deaths belong to the preceding Nine Years War and to the rising of 1641, in which several thousand Protestant settlers were killed and many more died after being stripped and driven out in winter, with reprisal killings of Catholics following; those events are counted separately from the plantation.
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