During the Crisis of the 3rd Century, when trade declined precipitously, Leptis Magna's importance also fell into a decline, and by the middle of the 4th century, even before it was completely devastated by the 365 tsunami, large parts of the city had been abandoned.
Durante a crise do século III, cando o comercio diminuíu precipitadamente, a importancia de Leptis Magna tamén caeu en declive, e para mediados do século IV, gran parte da cidade fora abandonada.