Nao Osumi - Nao Osumi

...It was originally part of Hyuga Province, and was also called Sono Kuni, and was considered the base of the Kumaso and Hayato. The powerful clans that divided the area were named Osumi Atai, Sono Kimi, Kashiki Agata Nushi, and Kimotsuki, and there are many Takatsuka-style ancient tombs in the area around the Kimotsuki River in the southeastern part of the peninsula, which is considered to be the base of Osumi Atai, the leader of the Osumi Hayato. A few years later than Satsuma Province, in 713 (Wadō 6), it was decided that "the four districts of Kimotsuki, Soo, Osumi, and Aira in Hyuga Province were divided to create the first Osumi Province" (Shoku Nihongi).

*Some of the terminology that mentions "Osumi Nao" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…はじめ日向国の一部をなし，襲国（そのくに）ともよばれ，熊襲（くまそ）･隼人（はやと）の根拠地とみなされていた。割拠の豪族として大隅直（あたい）や曾君（そのきみ），加士伎県主（かしきあがたぬし），肝衝（きもつき）などの名があり，大隅隼人の首領大隅直の地盤と目される半島東南部肝属（きもつき）川一帯に高塚式古墳が少なくない。薩摩国より数年おくれ，713年(和銅6)〈日向国肝坏（きもつき），贈於（そお），大隅，姶（あいら）の4郡を割いて，初めて大隅国を置く〉(《続日本紀》)ことになった。…

※「大隅直」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報