During the Thirty Years’ War, John Taylor served at the Habsburg courts in Brussels, Madrid, and Vienna. Although he figured prominently in Charles I's secret Habsburg foreign policy during the war and was one of the ‘persons of distinction’ included in the original Dictionary of National Biography, published information on Taylor is sparse. His story is especially compelling given his own and his family's connections with Continental Catholicism as well as his involvement, as a gentleman of indisputably Catholic background, in English diplomacy of the time.