Portrait of Maximilian I of Mexico (1832-1867)

Title: Portrait of Maximilian I of Mexico (1832-1867)
Artist: Franz Xaver Winterhalter
Date:1864

Portrait of Maximilian I of Mexico in coronation robes. At the behest of Mexican monarchists and French Emperor Napoleon III, Austrian Prince Maximilian agreed to serve as Emperor of Mexico. Original in Chapultepec Castle, Mexico City. Monarchs have often worn ceremonial robes at their coronations and investitures. The mantles of the emperors and kings are called coronation mantles. Some monarchs have taken an oath but were not crowned. Their mantles are of the same design as those of the crowned monarchs. There are also the less costly mantles that were used for other ceremonies. They are made after the fashion of the coronation mantles. Monarchs that were not crowned, petty rulers (such as Grand Dukes in Germany) and members of royal families are often depicted in this way. These ceremonial regal robes, "Prunkmäntel" in German, may be called "ceremonial regal robes" to distinguish them from the robes that were worn at coronations.

Source :
http://blog.fords.org/2014/05/05/matias-romero/emperador_maximiliano_i_de_mexico/
https://commons.wikimedia.org/wiki/Coronation_and_royal_robes