In Greek mythology , Helenus (; , " Helenos " ; ) was the son of King Priam and Queen Hecuba of Troy , and the twin brother of the prophetess Cassandra .
Head entity: helenus Q729332 4
Tail entity: hecuba Q193433 20
Relation (head \u2192 tail): P25
Inverse relation (tail \u2192 head): P40