IPA: /ɪnˈθroʊn/
KK: /ɪnˈθroʊn/
To place someone on a throne or to formally invest them with royal authority.
The ceremony was held to inthrone the new king in front of the gathered crowd.
Past: inthroned
Past Participle: inthroned
Inthrone is formed from "in-" (meaning into) and "throne" (from Old English "þron", meaning a seat or chair of authority). The word "inthrone" means to place someone into a position of authority or to install someone on a throne.
Think of 'placing someone into' ('in-') a 'seat of authority' ('throne') — that's what inthrone means.