Cannabis Ruderalis October 12, 2016 thcscience_admin Donal O'Brien may refer to: Domnall Mór Ua Briain (died 1194), king of Munster Donal O'Brien (hurler) (1940–2012), Irish hurler Donald O'Brien (actor) (1933), French-born Irish film and television actor See also[edit] Domnall Ua Briain (disambiguation)