Helenus was the son of Priam and Hecabe, and the twin of Cassandra. He was a noted seer and warrior who figures in the Iliad of Homer.

According to one account, he allowed the Greeks to capture him in the Trojan War because he was angry with the Trojans for giving Helen, whom he coveted for himself, to be married to Deïphobus. (But Deïphobus was killed before he could do so.) Perhaps we should translate his name as 'Helen man' in view of this.