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Presbyterian Church in Ireland, church organized in 1840 by merger of the Secession Church and the Synod of Ulster. In 1854 the Synod of Munster merged into the church. Presbyterianism in Ireland, except for scattered Puritan groups, began with the plantation of Ulster by King James I in 1610. He hoped to provide a strong Protestant population in Ireland that would support his policies. He therefore provided land that had belonged to the Irish for...