In the _Open Letter to the Christian Nobility_ Luther overthrew the three walls behind which Rome sat entrenched in her spiritual-temporal power; in the _Babylonian Captivity of the Church_ he enters and takes her central stronghold and sanctuary--the sacramental system by which she accompanied and controlled her members from the cradle to the grave; only then could he set forth, in language of almost lyrical rapture, the _Liberty of a Christian Man_. The first of these three great reformatory treatises of the year 1520, as they have been called, closed with the words: "I know another little song about Rome, and if their ears itch to hear it I will sing it for them, and pitch it in a high key. Dost thou take my meaning, beloved Rome?" (See above, p. 164.) That some ears were itching to hear his little song was brought home to Luther especially by two writings, the one appearing in the summer of 1520, the other published in the previous autumn, but not reaching Wittenberg until some months later. The former came from the pen of Augustin Alveld, that "celebrated Romanist of Leipzig," against whom Luther had culminated in _The Papacy at Rome_, promising further disclosures if Alveld "came again." (See Vol. I, p. 393.) He came again, this time with a _Tractatus de communione sub utraque specie_,--date of dedication, June 23, 1520. "The Leipzig ass has set up a fresh braying against me, full of blasphemies"; thus Luther describes it in a letter to Spalatin, July 22, 1520. (Enders, _Luther's Briewechsel_, II, no. 328.) The other work was the anonymous tract of a "certain Italian friar of Cremona," who has only recently been identified as Isidore Isolani, a Dominican hailing from Milan, who taught theology in various Italian cities, wrote a number of controversial works and died in 1528. (See Fr. Lauchert, _Die italienischen literarischen Gegner Luthers_, Freiburg, 1912.) The title of his tract is, _Revocatio Martini Lutheri Augustiniani ad sanctam Sedem_; its date, Cremona, November 20, 1520, according to Enders, which is a mistake for November 22,1519. Its beginning and close, which have epistolary character, are printed in Enders, II, no. 366, and one paragraph from each is translated in Smith, _Luther's Correspondence_, I, no. 199.