Feargus Edward O'Connor was an Irish Chartist leader and advocate of the Land Plan, which sought to provide smallholdings for the labouring classes. A highly charismatic figure, O'Connor was admired for his energy and oratory, but was criticised for alleged egotism. His newspaper Northern Star (1837–1852) was widely read among workers, becoming the voice of the Chartist movement.

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.