Since his biological father moved from Fujioka to Edo in 1639, scholars assume that he must have been born in Fujioka if he was born prior to his father's move, or in Edo if he was born after his father moved.
実父が寛永16年に藤岡から江戸に移っているので、生年がそれ以前ならば生地は藤岡、それ以後なら生地は江戸と推測される。