Odgar, Otgar, or Otger was the Archbishop of Mainz from 826 until his death.

During the years 838–839, Otgar supported Louis the Pious

Louis the Pious

Louis the Pious , also called the Fair, and the Debonaire, was the King of Aquitaine from 781. He was also King of the Franks and co-Emperor with his father, Charlemagne, from 813...

 against his son Louis the German

Louis the German

Louis the German , also known as Louis II or Louis the Bavarian, was a grandson of Charlemagne and the third son of the succeeding Frankish Emperor Louis the Pious and his first wife, Ermengarde of Hesbaye.He received the appellation 'Germanicus' shortly after his death in recognition of the fact...

 who was in rebellion and trying to get all of East Francia under his control. He remained strongly opposed to the younger Louis even after the elder's death in 840. He supported Lothair I

Lothair I

Lothair I or Lothar I was the Emperor of the Romans , co-ruling with his father until 840, and the King of Bavaria , Italy and Middle Francia...

 in the civil war that lasted until 843. In 842, he even tried to prevent Louis the German from meeting Charles the Bald

Charles the Bald

Charles the Bald , Holy Roman Emperor and King of West Francia , was the youngest son of the Emperor Louis the Pious by his second wife Judith.-Struggle against his brothers:He was born on 13 June 823 in Frankfurt, when his elder...

 and allying against Lothair. When Otgar finally died, Louis's hold on East Francia strengthened under his successor, Rabanus Maurus

Rabanus Maurus

Rabanus Maurus Magnentius , also known as Hrabanus or Rhabanus, was a Frankish Benedictine monk, the archbishop of Mainz in Germany and a theologian. He was the author of the encyclopaedia De rerum naturis . He also wrote treatises on education and grammar and commentaries on the Bible...

.

Sources

• Annales Fuldenses
  Annales Fuldenses
  The Annales Fuldenses or Annals of Fulda are East Frankish chronicles that cover independently the period from the last years of Louis the Pious to shortly after the end of effective Carolingian rule in East Francia with the accession of the child-king, Louis III, in 900...
  
   (Manchester Medieval series, Ninth-Century Histories, Volume II.) Reuter, Timothy (trans.) Manchester: Manchester University Press, 1992.