https://www.oed.com/view/Entry/45067?rskey=RX...
crowner, n.2
1. A person who crowns someone or something (in various senses of the verb).
▸ 1440 Promptorium Parvulorum (Harl. 221) 105 Crownere, or corownere, coronator.
?c1475 Catholicon Anglicum (BL Add. 15562) f. 30v A Crowner, Coronator.
1565 R. Shacklock tr. S. Hozjusz Hatchet of Heresies Ep. Ded. sig. aviii I desyre God to be..youre leader in all the slyppery wayes of this lyff, and your crowner in the blessed Kyngdome which is to come.
a1625 J. Fletcher Mad Lover v. i, in F. Beaumont & J. Fletcher Comedies & Trag. (1647) sig. Dv/2 O faire sweet Goddesse Queene of Loves..Crowner of all happy nights.
1660 R. Burney Κέρδιστον Δῶρον 15 He..is the holy Anointer, the Crowner himself.
1766 G. Baddelley Several Disc. ix. 205 He that is the author and finisher, or rather the leader and crowner of our faith.
a1825 J. Summerfield Serm. (1842) vi. 48 When the contest was over he awarded the crown to the lawful victor..; in this point of view he was called the crowner, so that he was both the leader and the crowner of the race.
1828 W. S. Landor Imaginary Conversat. III. ix. 185 The guardian of his infancy, the director of his youth, the crowner of his energies at the goal of manhood.
1860 E. B. Pusey Minor Prophets 564 He who was to be..the sure Foundation and Crowner of the whole building.
1906 R. E. Dennett At Back of Black Man's Mind ii. 13 He is the crowner, or, as it were, the creator of kings.
2010 H. Ricketts Strange Meetings ix. 132 ‘Glory of Women’..contained the bitter line ‘You crown our distant ardours while we fight’. This implicitly lumped [Robert]] Nichols along with the women as a crowner of distant ardours while others..did the actual fighting.
https://www.collinsdictionary.com/dictionary/...
crowner in American English
1. a person or thing that crowns
2. a crowning event or occurrence
https://www.jstor.org/stable/23368538
The Crowner at the Coronation of King Edward VII by Mrs Jennie C Morton (1901)
https://www.rorylewis.studio/blog/illuminatin...
Illuminating the Primate of All England: Rory Lewis Photographs Justin Welby, the Future Crowner of Kings