The Incoronation of T'Challa was a duel called upon by M'Baku of the Jabari Tribe in an attempt to challenge T'Challa for the title of King of Wakanda.
A week after his father's death at Helmut Zemo's hands, T'Challa then returned to his home country to be formally crowned king.
First, however, he decided to retrieve his former lover Nakia, a Wakandan spy, from her current mission with the help of Okoye. Upon arriving at Wakanda's capital, T'Challa was greeted by his mother and little sister, who held great expectations for him as the new heir.
By tradition, T'Challa needed to accept the challenge of any of the warriors chosen by the other four tribes of Wakanda for the title of King.