Decoronation

Near-synonym: accession

Source: wiktionary

More likely, should there be a decoronation of Old Fitz, is that there should be one crowned for the nonce, a caretaker king, who would reign until the special convention six months hence, when blood would flow as jousting takes a serious and earnest turn.

Source: wiktionary

This explains why there has been a constant stream of posthumous decoronations of Russian dictators: de-Ivanization followed the reign of Ivan the Terrible, de-Petrinization that of Peter 1, de-Nicholization that of Nicholas I and so on.

Source: wiktionary

The State Tinkers is one of many recoronations or even decoronations of George III that appeared in response to the unprecedented threats to the monarchy during the closing decades of the century.

Source: wiktionary