Riderch II was , according to the Harleian genealogies , the son of Eugein II , the son of King Dumnagual III of Alt Clut .
Head entity: dumnagual iii of alt clut Q1406600 20 21 22 23 24
Tail entity: eugein ii Q2258257 13 14
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40