However, it is valuable as an historical work because it offers insights into the Japanese Sengoku period (the Warring States period of Japan) from the perspective of Kyoto, Sakai City and various cities in Kyushu as viewed by the author, and for its objective and detailed descriptions of many Sengoku military commanders such as Nobunaga and Hideyoshi.
しかし、同時代史として、フロイス自身の目で見た京都や堺市、九州の諸都市の様子から、信長、秀吉など多くの戦国の武将たちの客観的かつ詳細な記述、各地の戦乱の詳細な記録などを含み、戦国時代(日本)の様子を知る貴重な資料となっている。