The Omi clans generally took their names from the geographic location from which they originated, such as the Soga (θζ), the Katsuragi (θε), the Heguri (εΉ³ηΎ€), the Kose (ε·¨ε’), the Kasuga (ζ₯ζ₯), and the Izumo (εΊι²), thus making them regional chieftains in their own right.
The most powerful Omi added the prefix Ε (倧, lit. "great") to the Omi title, and were referred to as Εomi (倧θ£). Examples of Εomi mentioned in the Nihon Shoki included Katsuragi no Tsubura (θεε) during the reign of Emperor RichΕ«, Heguri no Matori (平羀馬ι³₯) during the reign of Emperors YΕ«ryaku and Seinei, Kose no Ohito (許ε’η·δΊΊ) during the reign of Emperor Keitai and the four generations of Sogas who dominated the title during the 6th and 7th centuries: Soga no Iname, Soga no Umako, Soga no Emishi and Soga no Iruka.
When the kabane system was reformed into the eight kabane system in 684 following a series of coup attempts, the powerful Omi of the time were given the kabane of Ason, which ranked second under the new system, and Omi itself was dropped to sixth in rank.
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