Within Monzel's limits, rubble was found that was interpreted as having been a Roman villa rustica, that is, an agricultural homestead.

After the end of Roman hegemony, the municipality belonged, beginning in 510, to Francia, and after that kingdom's division in the mid 9th century to Lotharingia.

This follows from an inventory of holdings made at that time by Saint Martin's Abbey in Trier in which osanna and muncele villam are named.

The cross on the dexter (armsbearer's right, viewer's left) side refers to Osann-Monzel's centuries-long allegiance to the Electorate of Trier.

The zigzag stripe (“fess dancetty”) is the arms formerly borne by another of the municipality's old feudal lords, the Counts of Manderscheid-Blankenhein.

Also on the sinister (armsbearer's left, viewer's right) side, the stylized bunch of grapes and the ears of wheat stand for the municipality's traditional winegrowing and agriculture respectively.