The Amago clan (尼子氏, Amago-shi), descended from the Emperor Uda (868–897) by the Kyogoku clan, descending from the Sasaki clan (Uda Genji). Kyogoku Takahisa in the 14th century, lived in Amako-go (Omi Province), and took the name 'Amago'. The family crest, is also the one of the Kyogoku clan. They were Shugodai (vice-Governors) of Izumo and Oki provinces for generations, for the Kyogoku Shugo branch , and their seat was Gassan Toda castle. The Amago fought the Ōuchi clan or the Mōri clan (who had been among their vassals), during Japan's Sengoku period.