Himyarite Kingdom
Several factors caused a significant decline of the Sabaean state and civilization by the end of the 1st millennium BC. Saba' was conquered by the Himyarite Kingdom in the first century BCE; but after the disintegration of the first Himyarite Kingdom of the Kings of Saba' and Dhū Raydān, the Middle Sabaean Kingdom reappeared in the early second century. Note that the Middle Sabaean Kingdom was different from the Ancient Sabaean Kingdom in many important respects. The Sabaean kingdom was finally conquered by the Ḥimyarites in the late 3rd century and at that time the capital was Ma'rib. It was located along the strip of desert called Sayhad by medieval Arab geographers, which is now named "Ramlat al-Sab'atayn".