(i) Matsuura, Nagasaki 長崎(県) 松浦(市) http://en.wikipedia.org/wiki/Matsuura,_Nagasaki
(Fukushima 福島 and Takashima 鷹島 are the largest [islands in the Imari Bay 伊万里 湾])
Nesides the first map in the above Wiki, the relative positions of Takashima, Imari Bay and its surroundings can be found in the map of
松浦市 http://ja.wikipedia.org/wiki/%E6%9D%BE%E6%B5%A6%E5%B8%82
(ii) Yoshifumi IKEDA 池田 榮史
(iii) University of the Ryukus http://en.wikipedia.org/wiki/University_of_the_Ryukyus
(琉球大学; abbreviated to Ryūdai 琉大; Established 1950; public)
(iv) Kamakura period http://en.wikipedia.org/wiki/Kamakura_period
(1185 or 1192-1333; shogunate 幕府 was based in Kamakura (present-day Kamakura, Kanagawa 神奈川(県) 鎌倉(市)) [though emperors held court at Kyoto])
(v) Goryeo 高麗 (918-1392) http://en.wikipedia.org/wiki/Goryeo
(vi) Battle of Bun'ei http://en.wikipedia.org/wiki/Battle_of_Bun%27ei
(文永の役; Nov 19, 1274; Yuan navy landing at Hakata Bay were grossly outnumbered by the samurai force; [but] the samurai were hopelessly outmatched: The Mongols also employed an early form of rocket artillery, and their infantry used phalanx-like tactics, holding off the samurai with their shields and spears)
* Koan 弘安 (1278-1288) was a Japanese era name 年号 [shared by two emperors]: Go-Uda-tennō 後宇多天皇 (1267-1324; reign 1274-1287 compelled to abdicate) and Fushimi-tennō 伏見天皇 (1265-1317; reign 1287-1298)).
Kōan (Kamakura period) http://en.wikipedia.org/wiki/K%C5%8Dan_(Kamakura_period)