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Timgad (; known as Marciana Traiana Thamugadi) was a Roman city in the Aurès Mountains of Algeria. It was founded by the Roman Emperor Trajan around CE 100. The full name of the city was "Colonia Marciana Ulpia Traiana Thamugadi". Emperor Trajan named the city in commemoration of his mother Marcia, eldest sister Ulpia Marciana, and father Marcus Ulpius Traianus.