Carthusians returned to London, the Grey Friars occupied a house at
Greenwich, the Dominicans took possession of St. Bartholomew's, and
the Benedictines were installed in Westminster (1556).

The queen, who two years before had been full of courage and hope,
began to lose confidence in the success of her work. The Spanish
marriage was the beginning of her misfortunes, and the apparent
dependence of Catholicism on Spanish help proved to be the undoing of
the Catholic religion in England. Disappointed in the birth of an
heir, deserted by her husband who found enough to engage his attention
in Spain and the Netherlands, confronted with conspiracies promoted by
heretics and encouraged for its own selfish purpose by France,
doubtful of the real sentiments of Elizabeth, and with hardly any
friends upon whose advice she could rely with confidence, it is not to
be wondered at that Mary felt inclined to despair. She was determined,
however, to continue the work she had begun, and to see that at least
during her life heresy should be put down with a heavy hand.
Unfortunately for the success of her projects she was involved in
difficulties with Rome. Paul IV. (1555-59) was a man of stern,
unbending character, firmly resolved to maintain the rights and
liberties of the Holy See. Annoyed at the domineering policy of
Charles V., and of his son Philip II., he was anxious to put an end to
Spanish rule in Naples. The relations became so embittered that a
Spanish force under the command of the Duke of Alva crossed the
frontiers of the Papal States, and Paul IV. recalled his agents from
Philip's territories (1557). France decided to support the Pope, and
soon active hostilities began. Philip, for whose return to England
Mary had so often appealed in vain, came back early in 1557, but only
to request that England should join with him in a war with France.