Major aim = reinstate traditional Catholic doctrines, services, and ornaments in the Church
Mary had been brought up by COA as a strict Cath
When H had manipulated religion to divorce COA, denied the authority of the Pope and seized control over the Church for himself, Mary had been horrified
Saw the break with Rome as a sinful act and was determined to correct it
Destruction of Church property and the rewriting of the Prayer Book only confirmed her desire to put things right and restore the old religion