John Christian Jacobi served as keeper of the Royal German Chapel at a Palace locted in what city?
John Christian Jacobi:  He served as keeper of the Royal German Chapel, St James's Palace from 1714 until his death. St James's Palace:  Located in the City of Westminster, although no longer the principal residence of the monarch, it is the ceremonial meeting place of the Accession Council and the London residence of several members of the royal family.
City of Westminster