According to the document that had been passed down in Rome, Martinho was thought to be born in Hasami, Hizen Province, who was the son of Nakatsukasa HARA, a prominent figure of the Omura territory.
ローマに残された資料から彼は肥前国波佐見の生まれであったと考えられ、大村領の名士、原中務の子。