During the next centuries Baalbeck fell successively to the Omayyad, Abbasid, Toulounid, Fatimid and Ayyoubid dynasties.Sacked by the Mongols about 1260, Baalbeck later enjoyed a period of calm and prosperity under Mamluke rule.D., Byzantine Emperor Constantine officially closed the Baalbeck temples.At the end of the 4th century, the Emperor Theodosius tore down the altars of Jupiter's Great Court and built a basilica using the temple's stones and architectural elements.The small circular structure known as the Temple of Venus, was probably finished at this time as well.
The largest and most noble Roman temples ever built, they are also among the best preserved.
Local influences are also seen in the planning and layout of the temples, which vary from the classic Roman design.
Over the centuries Baalbeck's monuments suffered from theft, war and earthquakes, as well as from numerous medieval additions.
The Propylaea and the Hexagonal Court of the Jupiter temple were added in the 3rd century under the Severan Dynasty (193-235 A.
D.) and work was presumably completed in the mid-3rd century.