Diarmaid Ó Súilleabháin, Irish language writer whose chosen theme is contemporary urban life, dies on June 5, 1985. He is acknowledged as an important Irish language modernist. He is also active in the Irish republican movement and a member of Sinn Féin.

Ó Súilleabháin is born on the Beara Peninsula in County Cork on July 29, 1932. His mother, Máire Áine Ní Dhrisceoil, is a primary school teacher and his father, John O’Sullivan, is a small farmer. He marries Úna Ní Chléirigh on October 28, 1954, and they have two sons and three daughters.

Ó Súilleabháin is awarded a scholarship to Coláiste Íosagáin, a Catholic secondary school in Ballyvourney, where he is influenced by Friar Peadar Ó Loingsigh, and qualifies as a primary teacher in St. Patrick’s College, Drumcondra. He devotes his life to teaching. He settles in Gorey, County Wexford, and works there as a primary teacher for the Christian Brothers school.

Best known now for his literary work, Ó Súilleabháin writes ten novels, two of them for teenagers. Maeldún (1972) is a pioneering Irish novel that explores sexuality. He writes seven unpublished plays but most of them are shown in Damer Hall and the Peacock Theatre. Three plays that he writes include Bior, Ontos and Macalla and he writes a collection of short stories, Muintir (1970). A story from Muintir called ‘D’ is translated into English and adapted for the stage by Vivian McAlister and is performed by the Dublin University Players in May 1977.

Like Eoghan Ó Tuairisc, Ó Súilleabháin “challenged the critical orthodoxy by openly proclaiming that their standards could not be those of the Gaeltacht and by demanding a creative freedom that would acknowledge hybridity and reject the strictures of the linguistic purists.” He and Máirtín Ó Cadhain are considered the two most innovative Irish language authors to emerge in the 1960s. He often writes in a stream of consciousness, and his style influences younger writers. His writing “explores the problem of recovering idealism and cultural wholeness in an increasingly shallow and materialistic Irish society.” He is elected as a member of the Irish Academy of Letters and wins more literary prizes than any other living Irish author.

Ó Súilleabháin writes a collection of poetry, Cosa Gréine, which is published and launched in Dublin in 2013, twenty-eight years after his death.

Ó Súilleabháin is an active Irish republican, particularly in publicizing the republican struggle, and is a member of Sinn Féin’s ruling body beginning in 1971. He spends short periods in prison because of activities related to his political beliefs.