Oshimaso - Oshima no Sho

Japanese: 大島荘 - おおしまのしょう

…The area is on a steep terrain with the highest peak being Mt. Nembutsu (382m) on the border with Yoshiumi-cho, and the settlement is located on the coast. At the end of the Heian period, Oshima was the site of the Oshima Manor, which was owned by Daigoji Temple, and the town area was the "Amahara-kata" of the manor. From the Northern and Southern Courts to the Muromachi period, the Kobayakawa clan held the position of land steward. …

From Yoshiumi Town

…Near the summit of Mt. Hachiman stands the giant rock known as Tenguiwa, and pottery from the Yayoi period has been excavated from the vicinity. At the end of the Heian period, Oshima was the site of the Oshima Manor, which was the domain of Daigoji Temple, and the town area was under its "Yoshiura side." In the Middle Ages, it was the base of the Murakami Navy, and there are many castle ruins, including Kumagatake Castle on Mt. Kiro, and Koryu-ji Temple at the foot of Mt. Kiro is said to be the family temple of Murakami Yoshihiro, who played an active role on the side of the Southern Court. …

*Some of the terminology that refers to "Oshimaso" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…吉海町との境にある念仏山(382m)を最高峰とする急峻な地形で，集落は海岸部に立地。平安時代末期，大島には醍醐寺領大島荘が置かれ，町域はその〈甘原方〉であった。南北朝～室町期には小早川氏が地頭職を有している。…