Mino and Kyoto
According to the NBTHK, Higo no Kami Teruhiro came from Mino. The NBTHK supposes that he later learned in the school of Umetada Myōju, in Kyoto, as did his son-in-law, Harima no Kami Teruhiro. The Sekai Daihyakka Jiten, in its article on Myōju, counts him among his pupils under the name of Aki Teruhiro.
Haga Yaichi’s dictionary of names makes him a swordsmith of Seki, in Mino, with the name 兼友 (Kanetomo), and gives his arrival in Aki in 1600 (Keichō 5); according to the same dictionary, the second, Harima no Kami, was called 兼久 (Kanehisa).
The Fukushima and the Asano
Kōdansha’s biographical dictionary, on Kotobank, places him in the Keichō era: he served Fukushima Masanori, followed him when his lord moved from Owari to Hiroshima, in Aki, and after the fall of the Fukushima passed to the Asano. The NBTHK says that, after the abolition of the Fukushima house, it was his descendants who served the Asano. The Heibonsha encyclopaedia cites the Teruhiro of the Asano of Aki among the swordsmiths that the lords kept in their household and who preserved the name and the technique until the end of the Edo period.
The Teruhiro of Aki
Kotobank says that in Aki there were more than ten swordsmiths with the name of Teruhiro; Haga Yaichi’s dictionary lists eleven, down to the Kansei era (1789-1801), without saying how it counts them. In his book on the shintō of the Keichō era, Markus Sesko devotes a chapter to each of the first two, Aki Teruhiro I and II. His dates of birth and death and the year in which he received the title of Higo no Kami are not recorded in the sources consulted.
Who he is confused with
Hizen Tadahiro signed 肥前国住藤原輝広 (Hizen no kuni jū Fujiwara Teruhiro) until 1641, when he received the title of Ōmi Daijō, according to the Kyūshū National Museum. Tsuda Echizen no Kami Teruhiro (照広), of Osaka, brother of Tsuda Sukehiro according to the Japanese Wikipedia, writes the name with another character.