The area of Osann-Monzel was probably first settled during Roman times, after Julius Caesar (100 BC to 44 BC) incorporated the Eifel and Moselle into the Roman Empire. Debris was found in the Monzel district that was interpreted as a Roman villa rustica, i.e. a single agricultural farmstead. After the end of Roman rule, the municipal area belonged to the Frankish Empire from 510 onwards and, after its division, to Lorraine from the middle of the 9th century. Lorraine, for its part, changed its affiliation several times between the East Frankish and the West Frankish empires. Finally, from 925 onwards, the municipality belonged, albeit with interruptions, to the western border region of Germany.
Known for over 1000 years
No direct documentary evidence is known from this period, but it is assumed that both Osann and Monzel were founded as early as the 7th or 8th century. It is certain that these places existed from at least 950. This is known from an enumeration of possessions of the Trier Abbey of Saint Martin at this time, in which "osanna" and "muncele villam" are mentioned. This first documentary mention was dated to the year 1008. Archbishop Balduin of Trier gave Monzel and Osann as a fief to the Count of Nassau-Saarbrücken in 1323, but the Himmerod Monastery also remained an important landlord in Monzel. In 1412, Philip of Nassau-Saarbrücken gave Osann and Monzel to the counts of Daun and zu Bruch as an after-fief. From the latter, Osann and Monzel then came to the Counts of Manderscheid as a marriage estate. From 1794, the two villages were under French rule, and in 1815 they were assigned to the Kingdom of Prussia at the Congress of Vienna. Since 1946 they have been part of the then newly founded state of Rhineland-Palatinate. On 7 June 1969, the municipalities of Osann and Monzel were dissolved, and the new municipality of Osann-Monzel was formed from the dissolved municipalities.