This was an attempt by the Catholic Church to bring many Protestants back to the old faith
William Allen established a seminary at Douai in the Netherlands to train Catholic priests in 1568. Allen aimed to send these priests to England as missionaries, with full backing from the Pope
Jesuits:
Society of Jesus established in 1540 and began to send missionaries to England by 1580
Wanted to convert Protestants to Catholicism
E saw Jesuits as a threat
Key Jesuits in England:
Edmund Campion and Robert Parsons arrived in 1580
Campion became a wanted man for fear he would incite rebellion