The prophecies are not part of the catholic magistery, however:
The Benedictine order traditionally said this Pope would come from their order, since a branch of the Benedictine order is called the Olivetans. St Benedict is said to have prophesied that before the end of the world, a member of his order would be Pope and would triumphantly lead the Church in its fight against evil. While the Holy Father chose the name "Benedict", this does not seem enough to fulfil the prophecy. Nor is it clear how Benedict XVI (a Bavarian) is "Glory of the Olives". Since he is said to have remarked in the Conclave after saying he would take the name Benedict that it was partly to honour Benedict XV, a pope of peace and reconciliation, perhaps Benedict XVI will be a peacemaker in the Church or in the World, and thus carry the olive branch.
And then, the day of the Lord:
In persecutione extrema S.R.E. sedebit Petrus Romanus, qui pascet oves in multis tribulationibus: quibus transactis civitas septicollis diruetur, & Judex tremêdus judicabit populum suum. Finis.
(In extreme persecution, the seat of the Holy Roman Church will be occupied by Peter the Roman, who will feed the sheep through many tribulations, at the term of which the city of seven hills will be destroyed, and the formidable Judge will judge his people. The End.)
It's interesting to read what he had wrote about his country, Ireland:
This prophecy, which is distinct from the prophecies attributed to St. Malachy concerning the popes, is to the effect that his beloved native isle would undergo at the hands of England oppression, persecution, and calamities of every kind, during a week of centuries; but that she would preserve her fidelity to God and to His Church amidst all her trials. At the end of seven centuries she would be delivered from her oppressors (or oppressions), who in their turn would be subjected to dreadful chastisements, and Catholic Ireland would be instrumental in bringing back the British nation to that Divine Faith which Protestant England had, during three hundred years, so rudely endeavoured to wrest from her. This prophecy is said to have been copied by the learned Dom Mabillon from an ancient manuscript preserved at Clairvaux, and transmitted by him to the martyred successor of Oliver Plunkett.