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[Greek heroic] Teucer was the son of the river Scamander and the nymph Idaea, and was the legendary ancestor of the Trojans; hence the Trojans are often called "Teucrians." He should not be confused with the Teucer who was the son of Telamon and the brother of Ajax, and who fought against Troy during the Trojan War.

Teucer, Teucri
n. m. Trojan; originally brother of Ajax; 

See more at Wikipedia.org...

[Greek heroic] Teucer was the son of the river Scamander and the nymph Idaea, and was the legendary ancestor of the Trojans; hence the Trojans are often called "Teucrians." He should not be confused with the Teucer who was the son of Telamon and the brother of Ajax, and who fought against Troy during the Trojan War.

Teucer, Teucri
n. m. Trojan; originally brother of Ajax;