One of the major cultures that dominated the Arabian Peninsula just before the rise of Islam was that of the nomadic Bedouin people. Family groups called clans formed larger tribal units, which reinforced family cooperation in the difficulty living conditions on the Arabian peninsula and protected its members against other tribes. 600 CE: Approximate locations of some of the important tribes and Empire of the Arabian Peninsula before the dawn of Islam. While ancient Arabian Christianity was strong in areas of Southern Arabia, especially with Najran being an important center of Christianity, Nestorian Christianity was the dominant religion in Eastern Arabia prior to the advent of Islam. Christianity existed in the Arabian Peninsula, and was established first by the early Arab traders who heard the gospel from Peter the apostle at Jerusalem (Acts 2:11), as well as those evangelized by Paul’s ministry in Arabia (Galatians 1:17) and by St Thomas. Pre-Islamic religion in Arabia consisted of indigenous polytheistic beliefs, Ancient Arabian Christianity, Nestorian Christianity, Judaism, and Zoroastrianism. Additionally, from the beginning of the first millennium BCE, Southern Arabia was the home to a number of kingdoms, such as the Sabaean kingdom, and the coastal areas of Eastern Arabia were controlled by the Iranian Parthians and Sassanians from 300 BCE. Among the most prominent civilizations were Thamud, which arose around 3000 BCE and lasted to about 300 CE, and Dilmun, which arose around the end of the fourth millennium and lasted to about 600 CE. Sources for these civilizations are not extensive, and are limited to archaeological evidence, accounts written outside of Arabia, and Arab oral traditions later recorded by Islamic scholars. Some of the settled communities in the Arabian Peninsula developed into distinctive civilizations. Pre-Islamic Arabia refers to the Arabian Peninsula prior to the rise of Islam in the 630s. Bedouin: a predominantly desert-dwelling Arabian ethnic group traditionally divided into tribes or clans.Nabatean: an ancient Semitic people who inhabited northern Arabia and Southern Levant, ca.Arab tribes begin to appear in the south Syrian deserts and southern Jordan around 200 CE, but spread from the central Arabian Peninsula after the rise of Islam in the 630s CE.The pre-Islamic Bedouins also hunted, served as bodyguards, escorted caravans, worked as mercenaries, and traded or raided to gain animals, women, gold, fabric, and other luxury items.The Bedouin tribes were nomadic pastoralists who relied on their herds of goats, sheep, and camels for meat, milk, cheese, blood, fur/wool, and other sustenance.Family groups called clans formed larger tribal units, which reinforced family cooperation in the difficult living conditions on the Arabian peninsula and protected its members against other tribes.Nomadic Bedouin tribes dominated the Arabian Peninsula before the rise of Islam.