Which preposition to use with monsignors

as Occurrences 1%

His old manner came back, and once more he spoke to Monsignor as to a child.

of Occurrences 1%

For the Pope, as I first heard from the Most Rev. Monsignor of Forli, his Master of the Chamber, has often observed that, were this possible, he, would gladly give some of his own years and his own blood to add to Michelangelo's life, to the end that the world should not so soon be robbed of such a man.

Which preposition to use with  monsignors