Turnus in Greek and Roman Biography and Mythology
（*Tu/rnos), a son of Daunus and Venilia, and king of the
Rutulians at the time of the arrival of Aeneas in Italy.
(Verg. A. 10.76, 616.) He was a brother of Juturna and related
to Amata, the wife of king Latinus. (12.138.) Alecto, by the
command of Hera, stirred him up to fight against Aeneas after
his landing in Italy. (7.408, &c.) He appears in the Aeneid as
a brave warrior, but in the end he fell by the hand of the
victorious Aeneas (12.926, &c.). Livy (1.2) and Dionysius also
mention him as king of the Rutulians, who allied himself with
the Etruscans against the Latins, consisting of Aborigenes and
Trojans. The Rutulians according to their account indeed were
defeated, but Aeneas fell. (Comp. AENEAS.)
[L.S] - A Dictionary of Greek and Roman biography and
mythology, William Smith, Ed.
Turnus in Wikipedia
In Virgil's Aeneid, Turnus was the King of the Rutuli, and the
chief antagonist of the hero Aeneas. Prior to Aeneas' arrival
in Italy, Turnus was the primary potential suitor of Lavinia,
daughter of Latinus, King of the Latin people. Upon Aeneas'
arrival, however, Lavinia is promised to the Trojan prince.
Juno, determined to prolong the suffering of the Trojans,
prompts Turnus to demand a war with the new arrivals. King
Latinus is greatly displeased with Turnus, but steps down and
allows the war to commence...