Timgad was a Roman-Berber town in the Aurès Mountains of Algeria. It was founded by the Emperor Trajan around AD 100. The full name of the town was Colonia Marciana Ulpia Traiana Thamugadi. Trajan commemorated the city after his mother Marcia, eldest sister Ulpia Marciana, and father Marcus Ulpius Traianus.
Located in modern-day Algeria, about 35 km east of the town of Batna, the ruins are noteworthy for representing one of the best extant examples of the grid plan as used in Roman city planning.