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Early Alans

The first mentions of names that historians link with the Alani appear at almost the same time in texts from the Mediterranean, Middle East and China.

In the 1st century CE, the Alans migrated westwards from Central Asia, achieving a dominant position among the Sarmatians living between the Don River and the Caspian Sea. The Alans are mentioned in the Vologases inscription which reads that Vologases I, the Parthian king between around 45 and 78 CE, in the 11th year of his reign (62 CE), battled Kuluk, king of the Alani. The 1st century CE Jewish historian Josephus supplements this inscription. Josephus reports in the Jewish Wars (book 7, ch. 7.4) how Alans (whom he calls a " Scythian " tribe) living near the Sea of Azov crossed the Iron Gates for plunder (72 CE) and defeated the armies of Pacorus, king of Media, and Tiridates, King of Armenia, two brothers of Vologeses I (for whom the above-mentioned inscription was made):

Now there was a nation of the Alans, which we have formerly mentioned somewhere as being Scythians, and living around Tanais and Lake Maeotis. This nation about this time laid a design of falling upon Media, and the parts beyond it, in order to plunder them; with which intention they treated with the king of Hyrcania; for he was master of that passage which king Alexander shut up with iron gates. This king gave them leave to come through them; so they came in great multitudes, and fell upon the Medes unexpectedly, and plundered their country, which they found full of people, and replenished with abundance of cattle, while nobody dared make any resistance against them; for Pacorus, the king of the country, had fled away for fear into places where they could not easily come at him, and had yielded up everything he had to them, and had only saved his wife and his concubines from them, and that with difficulty also, after they had been made captives, by giving a hundred talents for their ransom. These Alans therefore plundered the country without opposition, and with great ease, and proceeded as far as Armenia, laying waste all before them. Now, Tiridates was king of that country, who met them and fought them but was lucky not to have been taken alive in the battle; for a certain man threw a noose over him and would soon have drawn him in, had he not immediately cut the cord with his sword and escaped. So the Alans, being still more provoked by this sight, laid waste the country, and drove a great multitude of the men, and a great quantity of the other booty from both kingdoms, along with them, and then retreated back to their own country.

The fact that the Alans invaded Parthia through Hyrcania shows that at the time many Alans were still based north-east of the Caspian Sea. By the early 2nd century CE the Alans were in firm control of the Lower Volga and Kuban. These lands had earlier been occupied by the Aorsi and the Siraces, whom the Alans apparently absorbed, dispersed and/or destroyed, since they were no longer mentioned in contemporaneous accounts. It is likely that the Alans' influence stretched further westwards, encompassing most of the Sarmatian world, which by then possessed a relatively homogenous culture.

In 135 CE, the Alans made a huge raid into Asia Minor via the Caucasus, ravaging Media and Armenia. They were eventually driven back by Arrian, the governor of Cappadocia, who wrote a detailed report (Ektaxis kata Alanoon or 'War Against the Alans') that is a major source for studying Roman military tactics.

From 215 to 250, the Germanic Goths expanded south-eastwards and broke the Alan dominance on the Pontic Steppe. The Alans however seem to have had a significant influence on the culture of the Goths, who became excellent horsemen and adopted the Alanic animal style art. (The Roman Empire, during the chaos of the 3rd century civil wars, suffered damaging raids by the Gothic armies with their heavy cavalry before the Illyrian Emperors adapted to the Gothic tactics, reorganized and expanded the Roman heavy cavalry, and defeated the Goths under Gallienus, Claudius II and Aurelian.)

After the Gothic entry to the steppe, many of the Alans seem to have retreated eastwards towards the Don, where they seem to have established contacts with the Huns. Ammianus writes that the Alans were "somewhat like the Huns, but in their manner of life and their habits they are less savage." Jordanes contrasted them with the Huns, noting that the Alans "were their equals in battle, but unlike them in their civilisation, manners and appearance". In the late 4th century, Vegetius conflates Alans and Huns in his military treatise – Hunnorum Alannorumque natio, the "nation of Huns and Alans" – and collocates Goths, Huns and Alans, exemplo Gothorum et Alannorum Hunnorumque.

The 4th century Roman historian Ammianus Marcellinus noted that the Alans were "formerly called Massagetae," while Dio Cassius wrote that "they are Massagetae." It is likely that the Alans were an amalgamation of various Iranian peoples, including Sarmatians, Massagetae and Sakas. Scholars have connected the Alans to the nomadic state of Yancai mentioned in Chinese sources. The Yancai are first mentioned in connection with late 2nd century BCE diplomat Zhang Qian's travels in Chapter 123 of Shiji (whose author, Sima Qian, died c. 90 BCE). The Yancai of Chinese records has again been equated with the Aorsi, a powerful Sarmatian tribe living between the Don River and the Aral Sea, mentioned in Roman records, in particular Strabo.