Arthur O'Connor, was a United Irishman who was active in seeking allies for the Irish cause in England and in France. A proponent of radical democratic reform, in Ireland he was distinguished by publishing political appeals to women. Arrested on the eve of the 1798 rebellion, in 1802 he went into exile in France where, after being raised to the rank of General in a force that was to invade Ireland, fell out of favour with Napoleon. Among the positions he maintained publicly in his final years were a defence of the July Revolution in Paris and opposition to what he saw as the clericalism of Daniel O'Connell's movement in Ireland.

Thomas Addis Emmet was an Irish and American lawyer and politician. In Ireland, in the 1790s, he was a senior member of the Society of United Irishmen as it planned for an insurrection against the British Crown and Protestant Ascendancy. In American exile, he took up legal practice in New York, earned a reputation as a staunch abolitionist, and in 1812 to 1813 served as the state's Attorney General.