My latest occurrence is Erik Killmonger in the Black Panther #movie. Left to fend off by himself after he was considered "illegitimate" by a hereditary monarchy caste, he followed to the letter the rigged ritual to become Wakanda's ruler and won fair and square.

Then the existing ruling class (the elder council), for whom T'Challa and his family were just mere pawns of their very questionable isolationist politics, cheats (steal the power-granting flower) to reinstate T'Challa and trigger a civil war.

In the end, Killmonger is defeated but T'Challa would never have adopted more progressive views and more agency as a Wakanda ruler if it wasn't for him.