Although the extent of her activities is unclear, in suppressing the Society of United Irishmen the British commander, General Lake, described Greg as "the most violent creature possible" and as someone who had caused "very great [political] mischief" in her native Belfast.

By 1775 Greg and Cunningham was one of the largest shipping companies in New York, having benefitted from the rise in the prices of provisions during the Seven Years’ War and from the license to attack and plunder enemy vessels.

[4] In a public debate following Belfast's 1792 "Bastille Day" celebrations, Cunningham's objection to an immediate and liberal extension of the franchise to include Catholics was defeated by interventions from members of a new democratic club.

Hannah completed her education at a Unitarian academy at Stoke Newington outside London, where she lived with her cousin Thomas Rogers, a close friend and an immediate neighbour to Richard Price.

[8] Richard Price was the "non-conforming minister of eminence" that Edmund Burke pilloried in his Reflections on the Revolution in France (1790) as the leading light of a circle of "literary caballers and intriguing philosophers" naïve and seditious in their embrace of the French revolutionary doctrine of popular sovereignty.

[9] Possibly with her sister-in-law as a connection, Greg was closely acquainted with a number of these figures, including John Horne Tooke of the London Corresponding Society (arrested, but acquitted, in 1794 of high treason) and Roger O'Connor.

Having encountered Hannah More and her sisters in Bath and discussed their schools and other good works, Greg reported to McTier that she found their "minds crippled in an astonishing degree".

It is evidently from its levity, designed for our sex, but we wish to shew, that women as we are, we are not to be taken by anything so light.The author proceeds to turn back the charges levelled by the “Lover of Truth" of political violence against both the American and French revolutions.

In November of that year, Lord Lieutenant Camden informed the British Home Secretary, the Duke of Portland that Jane Greg and her brother had been giving food and assistance to some members of the Monaghan militia imprisoned in Belfast, who had been condemned to death for joining the United Irishmen.

[22] Not found on her person were letters that might have revealed the political sympathies of Lady Londonderry, Frances Stewart, sister to the Lord Lieutenant of Ireland, Earl Camden, and stepmother of the Irish Chief Secretary, Viscount Castlereagh.

[10] Martha McTier thought this was an imprudent decision on Greg's part: "It was curious and rather unlucky, that after all which passed and the far more which has been said, poor JG should make her first entrance here with an O'Connor party".