A friend whom I saw over the weekend when he was back in Oxford has given me the link to a very interesting, illustrated article on the Russian Imperial Coronation ceremony, and in particular the way it evolved to emphasis the quasi-sacerdotal or diaconal position of the Emperor, and the problems ( or indeed lack thereof) occasioned by the series of Empresses in the eighteenth century who acted in an otherwise exclusively male role at their coronations.
It can be viewed at http://www.pravoslavie.ru/english/print80559.htm
The Coronation of Emperor Nicholas II and Empress Alexandra in 1896
The Dowager Empress Marie Dagmar is to the left
Laurens Tuxen, 1898