This present letter must date from 1375, for the rebellion of the Tuscan cities was gathering when she wrote. It is evident that Catherine at the time had never met the Pope personally. She must, however, have gained from hearsay a fairly just idea of his character; in the letter--one of the most carefully composed which we have from her--we see her approaching him with frankness, dignity, and courage, and also with a rare degree of tact. It was one thing to speak her mind out through Gerard du Puy: it must have been another to speak directly to the Head of Christendom. How Catherine acquits herself the reader may judge. The hint that the "sweet Christ on earth," the father of the faithful, lacks self-knowledge, is made so delicately that offence could not be taken; yet as she proceeds the indirect suggestion becomes unmistakable. Gregory is that weak prelate in whom through self-indulgence holy justice is dead or dying; the smooth, peaceable man, who to avoid incurring displeasure, shuts his eyes to the corruption of the Church and the sins of her priests; he is the indolent physician who anoints when he should cauterize. As soon as she deems his mind prepared, comes the direct statement: "I hope by the goodness of God, venerable father mine, that you will quench this [self-love] in yourself, and will not love yourself for your own sake, nor your neighbour, nor God." Nor does she shrink from more specific mention of the dangers which beset him, in his devotion to the interests of "friends and parents," and considerations of temporal policy. It is with relief, here as ever, that Catherine passes from criticism implied or explicit to a strain of high enthusiasm by which she tries to rouse the soul to all of latent manhood it may possess. She heartens Gregory with stirring appeal to the memories of his great predecessors-- yet more with impassioned reminder of that mystery of divine love and sacrifice from which their strength was drawn. All that was possible to them is possible to him, "for the same God is now that was then." "And if up to this time we have not stood very firm," she says--associating herself, as usual, with the weakness she would condemn--"I wish and pray in truth that you deal manfully with the moment of time which remains, following Christ, whose vicar you are." Gentle encouragement, and a curious tone of almost maternal tenderness, pervade the rest of the letter. In dealing with the political situation which Gregory confronted, Catherine speaks without reserve. The suggestions concerning practical matters with which the letter closes are lucid and to the point. Altogether, it is a masterly document which the daughter of Jacopo Benincasa despatches to the Head of Christendom. Reading it, one finds no difficulty in understanding the influence which, as the sequel shows, she established over the sensitive and religious if weak spirit of Gregory XI. In the Name of Jesus Christ crucified and of sweet Mary: