In 1732 the presbytery of "Dunagall" (Donegal) was established in Lancaster (disambiguation)|Lancaster county, Pennsylvania.
His grandson, Niall (791-845), drove back the Vikings who in his time began to infest the coast of Donegal.
In1730-1732the stricter party in the presbyteries of New Castle and Donegal insisted on full subscription, and in 1736, in a minority synod, interpreted the adopting act according to their own views.
The union was not perfect; the presbytery of Donegal was for three years in revolt against the synod; and in 1762 a second presbytery of Philadelphia was formed; but the strength of the synod increased rapidly and at the outbreak of the War of Independence it had 11 presbyteries and 132 ministers.
It includes the counties Donegal, Londonderry, Antrim, Fermanagh, Tyrone, Ca van, Monaghan, Armagh and Down.