Sydney Owenson, who became Lady Morgan when she married in 1812, began one of the most successful and controversial writing careers of the nineteenth century in 1801, a pivotal moment in British history after the Act of Union made Ireland a province of the United Kingdom and Irish nationalist aspirations appeared to be permanently doomed. During the next four decades, Lady Morgan constructed a model of nationhood that successfully combated the politics of British imperialism in her homeland and served anticolonial movements throughout the British Empire and elsewhere. By romanticizing the history and traditions of indigenous societies in Ireland and other colonized nations, she challenged imperialist assumptions of cultural superiority and countered the drive to cultural homogeneity in imperialist systems. Retailed through her prolific writing in several genres, Lady Morgan's vision of a vigorously pluralistic national community was instrumental in initiating the historical process that has authorized aboriginal subcultures and...