This was written I think given the recent swimming of the Tiber of a fairly social media prominent OPC ruling elder who has taken his family and swum the Tiber to the shock of many.
Reformed or Forged Catholicity?
A Reformed Catholic was written by William Perkins in 1597, showing the the “places where the reformed religion agrees with and differs from the Roman religion.” Perkins sought to give a "declaration showing how near we may come to the present Church of Rome in sundry points of religion, and
gentlereformation.com