Why must Aeneas fight turnus?

Aeneas must fight Turnus to fulfill his destiny of establishing a new homeland for the Trojans in Italy, as prophesied by the gods. Turnus, the leader of the Rutulians and betrothed to Lavinia, opposes Aeneas's claim to the land and Lavinia's hand in marriage. Their conflict represents not only a personal rivalry but also the broader struggle between fate and free will, as well as the establishment of a new order. Ultimately, Aeneas's victory is essential for the founding of what will become Rome.