 Mary Queen of Scots was living in England under custody of Elizabeth I since her forced abdication of the Scottish throne in 1567.After a Catholic uprising in Scotland with the aim to place Mary on the English throne, a papal bull, "Regnans in Excelsis", was published in 1570 releasing all Catholics from allegiance to Elizabeth and threatening excommunication to any that continued in allegiance to Elizabeth.This gave way to a wave of anti-Elizabethan feelings among the Catholics.