Sir Dermot MacDermot had served as British Ambassador to Indonesia (1956–59) and Thailand (1961–65). He succeeded his brother as The MacDermot upon the latter's death in 1979. He wrote an account of the family titled "MacDermot of Moylurg: The Story of a Connacht Family". The book chronicles the affairs of the Kings of Moylurg and their neighbours over the course of six hundred years. It contains thirty-five family trees concerning MacDermots and their related families, and ten appendices.[citation needed]
MacDermot died before seeing the book in print, but it was published shortly after by his sons Niall (who succeeded him as Prince of Coolavin) Hugh and Connor.[citation needed]
Cairnduff, Maureen. "MacDermot, The: Sir Dermot, Prince of Coolavin". Who's Who in Ireland: The Influential 1,000. Dublin: Vesey. ISBN978-0-9510120-0-0. or subsequent editions
"Mac Dermot of Moylurg: The Story of a Connacht Family", Dermot MacDermot, 1996.