18 February – a group of Protestant English settlers surrender to Irish authorities atCastlebar inCounty Mayo in hopes of having their lives spared, but are killed one week later atShrule on orders of Edmond Bourke.
17 March – a group of nobles sign the "Catholic Remonstrance" atTrim, County Meath addressed to King Charles I.
19 March – the citizens ofGalway seize an English naval ship and close the town gates in support of theIrish Rebellion of 1641.
10 May – in a Catholic synod atKilkenny, bishops draft theConfederate Oath of Association, calling on Catholics to swear allegiance to Charles I and to obey orders and decrees made by a "Supreme Council of the Confederate Catholics", hence the rebels become known asConfederate Ireland.[3]
