What happens when a society attempts to obscure inconvenient episodes in its past? In 1798, Ulster Protestants—in particular Presbyterians—participated alongside Catholics in the failed republican rebellion of the United Irishmen. In subsequent years, communities in counties Antrim and Down that had been heavily involved in the insurrection reconciled with the newly formed United Kingdom and identified with unionism. As Protestant loyalists closed ranks in face of resurgent Catholic nationalism, with many joining the Orange Order, Presbyterians had a vested interest to consign their rebel past to oblivion. Uncovering a vernacular historiography, to be found in oral traditions and often-unnoticed local writings, Guy Beiner shows that recollections of the rebellion persisted under a public facade of forgetting. Beneath a culture of silencing and reticence, he finds muted traditions of forgetful remembrance. Beiner follows the dynamics of social forgetting for over two centuries, starting with anxieties of being forgotten that preceded the insurrection. He reveals how bitter memories of repression prevented a policy of amnesty from facilitating amnesia. Clandestine traditions of defiant remembrance were regenerated and transmitted over several generations, yet when commemoration emerged into the open, it was met with violent responses. Prohibitions on public remembrance of 1798 seemed to come to an end by the bicentennial year of 1998, with the signing of the peace agreement in Northern Ireland, however the ambiguity of memory continues into the current post-conflict era. Comparative references demonstrate the wider relevance of the historical study of social forgetting.