Bach (Johann Sebastian .. there were many musical Bach's in the family) owned and wrote for harpsichords, lute-harpsichords, violin, viola, cellos, a viola da gamba, lute and spinet.
Never had a piano, not even a fortepiano .. though reportedly he played one once.
He had to improvise on the Hammerklavier when visiting Frederick the Great in Potsdam. That (improvising for Frederick) is also the starting point for the later creation of https://en.wikipedia.org/wiki/The_Musical_Offering .
Never had a piano, not even a fortepiano .. though reportedly he played one once.