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Ur-Nungal of Uruk was the sixth Sumer ian ruler in the First Dynasty of Uruk ( ca. 26th century BC ) , and son of Gilgamesh according to the Sumerian king list .
 Ur-Nungal, Uruk, Uruk, Gilgamesh
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ur-Nungal, Uruk, Uruk, Gilgamesh