Sinn Fein". Four TDs represented two separate constituencies: Éamon de Valera, Arthur Griffith, Eoin MacNeill and Liam Mellowes. Ordinarily, this would prompt them to choose one constituency to represent, and to move a writ for a by-election in the other constituency. By-elections The following Westminster by-elections to Irish seats were filled by Unionists who sat at Westminster. See also Historic Dáil constituencies Notes References 1st Dáil 01