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Ancient history

With its long sea border between eastern and western civilizations, Yemen has long existed at a crossroads of cultures with a strategic location in terms of trade on the west of the Arabian Peninsula. Large settlements for their era existed in the mountains of northern Yemen as early as 5000 BC. The Sabaean Kingdom came into existence in at least the 12th century BC. The four major kingdoms or tribal confederations in South Arabia were Saba, Hadhramaut, Qataban, and Ma'in.

Sabaʾ (Arabic: سَـبَـأ) is thought to be biblical Sheba and was the most prominent federation. The Sabaean rulers adopted the title Mukarrib generally thought to mean unifier, or a priest-king, or the head of the confederation of South Arabian kingdoms, the "king of the kings". The role of the Mukarrib was to bring the various tribes under the kingdom and preside over them all. The Sabaeans built the Great Dam of Marib around 940 BC. The dam was built to withstand the seasonal flash floods surging down the valley.

By the third century BC, Qataban, Hadhramaut, and Ma'in became independent from Saba and established themselves in the Yemeni arena. Minaean rule stretched as far as Dedan, with their capital at Baraqish. The Sabaeans regained their control over Ma'in after the collapse of Qataban in 50 BC. By the time of the Roman expedition to Arabia Felix in 25 BC, the Sabaeans were once again the dominating power in Southern Arabia. Aelius Gallus was ordered to lead a military campaign to establish Roman dominance over the Sabaeans.

The Romans had a vague and contradictory geographical knowledge about Arabia Felix. A Roman army of 10,000 men was defeated before Marib. Strabo 's close relationship with Aelius Gallus led him to attempt to justify his friend's defeat in his writings. It took the Romans six months to reach Marib and 60 days to return to Egypt. The Romans blamed their Nabataean guide and executed him for treachery. No direct mention in Sabaean inscriptions of the Roman expedition has yet been found.

After the Roman expedition (perhaps earlier) the country fell into chaos, and two clans, namely Hamdan and Himyar, claimed kingship, assuming the title King of Sheba and Dhu Raydan. Dhu Raydan, i.e., Himyarites, allied themselves with Aksum in Ethiopia against the Sabaeans. The chief of Bakil and king of Saba and Dhu Raydan, El Sharih Yahdhib, launched successful campaigns against the Himyarites and Habashat, i.e., Aksum. El Sharih took pride in his campaigns and added the title Yahdhib to his name, which means "suppressor"; he used to kill his enemies by cutting them to pieces. Sana'a came into prominence during his reign, as he built the Ghumdan Palace as his place of residence.

The Himyarite annexed Sana'a from Hamdan around 100 AD. Hashdi tribesmen rebelled against them and regained Sana'a around 180. Shammar Yahri'sh had conquered Hadhramaut, Najran, and Tihamah by 275, thus unifying Yemen and consolidating Himyarite rule. The Himyarites rejected polytheism and adhered to a consensual form of monotheism called Rahmanism.

In 354, Roman Emperor Constantius II sent an embassy headed by Theophilos the Indian to convert the Himyarites to Christianity. According to Philostorgius, the mission was resisted by local Jews. Several inscriptions have been found in Hebrew and Sabaean praising the ruling house in Jewish terms for "...helping and empowering the People of Israel."

According to Islamic traditions, King As'ad the Perfect mounted a military expedition to support the Jews of Yathrib. Abu Kariba As'ad, as known from the inscriptions, led a military campaign to central Arabia or Najd to support the vassal Kingdom of Kinda against the Lakhmids. However, no direct reference to Judaism or Yathrib was discovered from his lengthy reign. Abu Kariba died in 445, having reigned for almost 50 years. By 515, Himyar became increasingly divided along religious lines and a bitter conflict between different factions paved the way for an Aksumite intervention. The last Himyarite king Ma'adikarib Ya'fur was supported by Aksum against his Jewish rivals. Ma'adikarib was Christian and launched a campaign against the Lakhmids in southern Iraq, with the support of other Arab allies of Byzantium. The Lakhmids were a bulwark of Persia, which was intolerant to a proselytizing religion like Christianity.

After the death of Ma'adikarib Ya'fur around 521, a Himyarite Jewish warlord called Dhu Nuwas rose to power. Emperor Justinian I sent an embassy to Yemen. He wanted the officially Christian Himyarites to use their influence on the tribes in inner Arabia to launch military operations against Persia. Justinian I bestowed the "dignity of king" upon the Arab sheikhs of Kindah and Ghassan in central and northern Arabia. From early on, Roman and Byzantine policy was to develop close links with the powers of the coast of the Red Sea. They were successful in converting Aksum and influencing their culture. The results concerning to Yemen were rather disappointing.

A Kendite prince called Yazid bin Kabshat rebelled against Abraha and his Arab Christian allies. A truce was reached once the Great Dam of Marib had suffered a breach. Abraha died around 570. The Sasanid Empire annexed Aden around 570. Under their rule, most of Yemen enjoyed great autonomy except for Aden and Sana'a. This era marked the collapse of ancient South Arabian civilization, since the greater part of the country was under several independent clans until the arrival of Islam in 630.