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Arioch (Hebrew: אַרְיוֹךְ ’Aryōḵ) appears in the Book of Genesis as the name of the "King of Ellasar", who participated in the Battle of the Vale of Siddim. The battle is described in Genesis as consisting of four kings, led by Chedorlaomer of Elam (Amraphel, Arioch, Chedolaomer, and Tidal), engaging in a punitive expedition against five kings of Canaan who rebelled against Chedorlaomer (Bera, Birsha, Shinab, Shemeber, and the king of Bela). The same story is also mentioned in the Book of Jubilees, where Arioch is called "king of Sellasar". As in the case of other stories from the Book of Genesis, the consensus of modern scholarship is that these stories do not constitute reliable history.
Some historians placed the area where Arioch ruled in Asia Minor but theories as to its specific locations differ with some claiming it was in Pontus while others cite Cappadocia and Antioch. There are also sources that associated Ellasar with the kingdom of Larsa and that Arioch could be a one of its king called Eri-Aku, an Akkadian translation for the name Rim-Si, where rim meant servant and Sin as the Semitic name of the moon god (Agu or Aku in Akkadian). This theory is also linked to the Mongolian invasion of Babylon due to the Mongolian origin of the name Chedorlaomer (Kudur Lagamar).
By the 20th century, this theory became popular so that it was common to identify Arioch with Eriaku — through the alternative reading of either Rim-Sin or his brother Warad-Sin, who were both believed to be contemporary with Hammurabi.