In 1035 , Tancred of Hauteville 's three eldest sons ( William " Iron Arm " , Drogo and Humphrey ) arrived in Aversa from Normandy .
Head entity: drogo Q426192 17
Tail entity: tancred of hauteville Q26731 3 4 5
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40