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The Mishina school
According to the Japanese Sword Index, the Mishina school (三品派, Mishina-ha) was founded by Kanemichi in Mino at the end of Muromachi; it moved to Yamashiro, and his sons were Iga no Kami Kinmichi, Tanba no Kami Yoshimichi, Etchū no Kami Masatoshi and Rai Kinmichi. The Japanese Wikipedia counts the move of the Mino smiths to Kyoto, with the Mishina, among the foundations of early shintō.
The first
According to the Japanese Wikipedia, the first Hisamichi was born in 1626 (Kan'ei 3) in Nomura, in the Yasu district of the province of Ōmi, of the Hori family. He went up to Kyoto, trained with Echigo no Kami Rai Kinmichi (越後守来金道, Echigo no Kami Rai Kinmichi), second of the Rai Kinmichi house, and received from him the surname Mishina.
He first held the title of Ōmi Daijō and later that of Ōmi no Kami. Works of his are known from 1665 (Kanbun 5) to the end of the Genroku era (1704), and he died in 1711 (Shōtoku 1), aged 85. With Iga no Kami Kinmichi, Rai Kinmichi, Tanba no Kami Yoshimichi and Etchū no Kami Masatoshi he makes up the five smiths of Kyoto, the 京五鍛冶 (Kyō go-kaji), and the school prospered throughout the Edo period alongside those of Umetada and Horikawa.
The second, Hisatsugu
According to the Japanese Wikipedia, the second was the eldest son of the first, Hisatsugu (久次, Hisatsugu); in the Genroku era father and son signed blades together. His dates are not recorded.