A usurper is an illegitimate or controversial claimant to power, often but not always in a monarchy.[1][2] In other words, one who takes the power of a country, city, or established region for oneself, without any formal or legal right to claim it as one's own.[3] Usurpers can rise to power in a region by often unexpected physical force such as via a coup d'état, as well as through political influence and deceit.[4]