"On 25 February 1570, Pope Pius V's "Regnans in Excelsis" bull excommunicated the English Queen Elizabeth I, and any who obeyed her. This papal bull also required all Roman Catholics to rebel against the English Crown as a matter of faith. In response, in 1571 legislation was enacted making it treasonable to be under the authority of the Pope, including being a Jesuit, being Roman Catholic or harbouring a Roman Catholic priest. The standard penalty for all those convicted of treason at the time was execution by being hanged, drawn and quartered."

https://en.wikipedia.org/wiki/List_of_Catholic_martyrs_of_the_English_Reformation