Marcomer, also spelled Marcomeres, Marchomer, or Marchomir (c. ? - 392) was a Frankish Dux in the late 4th century who assisted in an invasion of the Roman Empire in the year 388, as the usurper and leader of the whole of Roman Gaul, Magnus Maximus, was surrounded by Theodosius I in the city of Aquileia.
History
The invasion is documented by Gregory of Tours who cited the now lost work of Sulpicius Alexander. According to this account, Marcomer, Sunno and Genobaud invaded the Roman provinces Germania Inferior and Gallia Belgica in Gaul. They broke through the limes, killed many people, destroyed the most fruitful lands and made the city of Cologne panic.
After this raid, the main body of the Franks moved back over the Rhine with their booty. Some of the Franks remained in the Belgian wood called "Silva Carbonaria". When the Roman generals Magnus Maximus, Nanninus and Quintinus heard the news in Trier, they attacked those remaining Frankish forces near the Silva Carbonaria and killed many of them. After this engagement, Quintinus crossed the Rhine to punish the Franks in their own country, however his army was surrounded and beaten.