4. Destruction of Naissus
In 441 AD Attila managed to conquer Naissus, the birthplace of Constantine the Great and important trading and manufacturing hub of the Eastern Roman empire. Proving that huge walls were no longer an obstacle to him, Atilla rounded up all the artisans taking them as his prisoners as they were a valuable asset. Then he plundered the riches of the city, wrecking it and slaughtering the rest of the population in the process. Later depictions of Naissus mention it as a deserted ruin. It took more than a century for the city to recover, but it never reached its former glory.