Imbrius (Ancient Greek: Ἴμβριος), son of Mentor rich in horses, is a Trojan defender from Pedaeum who married Medesicaste, an illegitimate daughter of Priam. When the Achaeans landed he moved into Priam's household and fought at the ships until Teucer killed him.
Adapted from Wikipedia, "Imbrius" · CC BY-SA 4.0
I.Son-in-law of Priam
Homer (Iliad 13.170–181) places Imbrius at Pedaeum before the war, husband of Medesicaste. Once the curved ships arrive he returns to Ilios, where Priam treats him like a son. In the fighting about the ships Teucer is first to slay him; the Aiantes then strip and carry off the body.
Pausanias also knows the Pedaean marriage when commenting on Trojan genealogies. Keep him distinct from any Eetion surnamed Imbrius.
II.Homonym care
The atlas id imbrius-trojan is Mentor's son alone — paired with medesicaste-trojan — not a generic Imbrian ethnonym.