an Irish physician and man of letters. A descendant of the Ó Fearghuis medical family of Connacht, Doctor Fergus a native of County Mayo but moved to Dublin city early in his adult life. He was a scribe, and book collector, as well as a member of the Ó Neachtáin literary circle in early 18th century Dublin. He amassed a huge library of Irish manuscripts, which included the Liber Flavus Fergusiorum, a medical text created by his ancestors in the 14th century.
