Namesakes
Donnchad I the Gracious
(m) c. 1001-1040 
Scottish Kings and Queens 1034-1040
Shakespearian Characters (Duncan) Macbeth
Donnchad II
(m) c. 1060-1094
Scottish Kings and Queens 1094
Donnchad Donn
(m) ?-944
Irish Kings 919-944
Donnchad Midi
(m) 733-797
Irish Kings 770-797
Donnchad mac Briain
(m) ?-1064
Irish Kings 1024-1063