Ubara-tutu (or Ubartutu) was a king of Shuruppak, an ancient Sumerian city located in what is today Iraq. He is thought to have been the eighth (or ninth) and last antediluvian King. According to the Sumerian king list he reigned for 5 sars and 1 ner, or 18,600 years -- from 18,600 years before the Flood to the Flood. He is the father of Ziusudra (or possibly Utnapishtim, depending on the version of the myth).
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[Mesopotamian] A king of Shurrupak (modern Fara, north-west of Uruk) and father of Utnapishtim. The only king of Kish named in the pre-diluvian King-List, apart from Utnapishtim.