He was unable to enthrone himself because his great grandmother was a concubine.
From the en.wikipedia.org
By the year 1000, Fujiwara no Michinaga was able to enthrone and dethrone emperors at will.
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Before dying, he requested to enthrone his elder brother.
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Siam sent troops to support the rebel prince, hoping to enthrone him and wrest influence from Gia Long over Cambodia.
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He said the Jacobites came to aid the English sympathisers, not to enthrone a king when they refused to help.
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Consequently, a faction of the royal council would prefer to enthrone Mpapatla's daughter when she comes of age.
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Enthrone Darkness Triumphant was a huge success for the band, and was their first release signed to Nuclear Blast, a German record label.
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However, relations became strained under Gia Long's successor Minh Mang as missionaries sought to incite revolts in an attempt to enthrone a Catholic.
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In 191, the coalition tried to further de-legitimize Dong Zhuo's position by offering to enthrone Liu Yu, who was eligible to be Emperor since he was a member of the royal clan.
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More examples
Invest: provide with power and authority; "They vested the council with special rights"
Put a monarch on the throne; "The Queen was enthroned more than 50 years ago"
(enthronement) coronation: the ceremony of installing a new monarch
An enthronement is a ceremony of inauguration, involving a person--usually a monarch or religious leader--being formally seated for the first time upon their throne. ...
To put on the throne in a formal installation ceremony called enthronement, equivalent to (and often combined with) coronation and/or other ceremonies of investiture; in a figurative sense, to help a candidate to the succession of a monarchy (as a kingmaker does), or by extention in any other ...