On this day, the 28th of January, in the Year of Lord 2015, we commemorate the passing of Blessed Charlemagne, Imperator Romanorum and Father of Europe.
The Collect of Blessed Charlemagne from an older edition of the Missale Romanum (H/T Fr. Benedict Anderson):
Omnipotens et misericors Deus, qui a gloria tua nullam conditionem excludis: te suppliciter exoramus, ut sicut beato Carolo confessori tuo, post terreni culmen Imperii, caelestis regni solium contulisti: ita meritis ejus et precibus nobis quoque famulis tuis aeternae felicitatis praemia largiaris. Per dominum nostrum.
For more on Charlemagne’s cult and his status as “Blessed,” see Reliquarian‘s entry, “Charlemagne: Saint of the Holy Roman Empire?“
Addendum 1/28/15: The Duplex office for the feast of S. Caroli Magni, including the proper readings at Matins, can be found in the Breviarium Romanum via Google Books here.