The Avernassetom (also known as Tom of Montenaken or Tumulus of Cortis) is a Gallo-Roman tumulus (burial mound) located on Tombeweg, south of Montenaken in the Limburg province of Belgium.
Dating back to the 2nd century AD, the tumulus has a diameter of approximately 23.0 meters and a height of 7.8 meters. It is part of a group of six burial mounds within a 1.5-kilometer radius of Montenaken. Situated on the Tommeveld, south of Tombeweg and north of the A3 motorway (E40) between Liège and Brussels, it is on the loamy plateau of Haspengouw.
According to the excavation plan by H. Schuermans, the tumulus is oriented northeast-southwest, with the western slope steeper than the eastern side. Historical accounts from V. Gauchez (1882) and E. Hublard (1903) suggest that the tumulus was looted by the troops of Louis XV or, according to L. Renard (1900–1901), by the troops of Louis XIV. Evidence of a square pit and traces of the plundering have been discovered.
