In the plantation of Ulster James I and VI granted eight townlands to Sir William Parsons, Surveyor General of Ireland.

In the 18th century two new parishes were created in Tyrone, and the same family, the Lowrys (from whom issued the Earls of Belmore), was involved in the establishment of both.

The arrangement was confirmed in 1731 by an Order in Council, which had the same legal status as an Act of Parliament, and the articles of agreement under which it was conducted by the two parties involved, Lord Tyrone and Robert Lowry, suggest the tone: The name of each of the new erected parishes shall be wrote on a separate scrole of parchment, roll'd up and put into a hatt, to be held by an indeffernet person,... and that the said Marcus, Lord Viscount of Tyrone, and Robert Lowry shall each put his hand into the said hatt, and take thereout one of the said scroles, and that the advowson of that parish which shall be mentioned in the said scrole .. to be drawn out of the said hatte, by the said Lord Tyrone, shall stand and be the advowson of the said .. Tyrone, his heirs and assigns, for ever.

James Lowry was granted the right to hold a weekly market in Pomeroy and an important event was the twice yearly Hiring Fair, held in May and November.

James Lowry undertook its management, replanted about 556 acres (225 ha) and left money to build Pomeroy House.

West of Pomeroy the railway reached its summit, 561 feet (171 metres) above sea level,[7] the highest point on Ireland's Irish gauge network.

[8] In 2006 the company, which has won five UK Great Taste Awards, expanded after securing a supply deal with Tesco.

[9] On Census Day (27 March 2011) the usually resident population of Pomeroy Settlement was 788 accounting for 0.04% of the NI total.