Some historiographers say that four kings , namely Cellach and Conall Cóel and the two sons of Áed Sláine , namely Diarmait and Blathmac , ruled in shared reigns .
Head entity: diarmait Q258386 21
Tail entity: áed sláine Q961521 17 18
Relation (head \u2192 tail): P40
Inverse relation (tail \u2192 head): P22