Joachim's immense and durable reputation as a prophet was due not so much to his genuine works as to the spurious ones circulated under his name. These were numerous--Prophecies of Cyril, and of the Erythræan Sybil, Commentaries on Jeremiah, the _Vaticinia Pontificum_, the _De Oneribus Ecclesiæ_ and _De Septem Temporibus Ecclesiæ_. In some of these, reference to Frederic II. would seem to indicate a period of composition about the year 1250, when the strife between the papacy and empire was at the hottest, and the current prophecies of Merlin were freely drawn upon in framing their exegesis. There can be little doubt that their authors were Franciscans of the Puritan party, and their fearless denunciations of existing evils show how impatient had grown the spirit of dissatisfaction. The apocalyptic prophecies were freely interpreted as referring to the carnal worldliness which pervaded all orders in the Church; all are reprobate, none are elect; Rome is the Whore of Babylon, and the papal curia the most venal and extortionate of all courts; the Roman Church is the barren fig-tree, accursed by Christ, which shall be abandoned to the nations to be stripped. It would be difficult to exaggerate the bitterness of antagonism displayed in these writings, even to the point of recognizing the empire as the instrument of God which is to overthrow the pride of the Church. These outspoken utterances of rebellion excited no little interest, especially within the Order itself. Adam de Marisco, the leading Franciscan of England, sends to his friend Grosseteste, Bishop of Lincoln, some extracts from these works which have been brought to him from Italy. He speaks of Joachim as one justly credited with divine insight into prophetic mysteries; he asks to have the fragments returned to him after copying, and meanwhile commends to the bishop's consideration the impending judgments of Providence which are invited by the abounding wickedness of the time.[14]
Of Joachim's genuine writings the one which, perhaps, attracted the most attention in his own day was a tract on the nature of the Trinity, attacking the definition of Peter Lombard, and asserting that it attributed a Quaternity to God. The subtleties of theology were dangerous, and in place of proving the Master of Sentences a heretic, Joachim himself narrowly escaped. Thirteen years after his death, the great Council of Lateran, in 1215, thought his speculation sufficiently important to condemn it as erroneous in an elaborate refutation, which was carried into the canon law, and Innocent III. preached a sermon on the subject to the assembled fathers. Fortunately Joachim, in 1200, had expressly submitted all his writings to the judgment of the Holy See and had declared that he held the same faith as that of Rome. The council, therefore, refrained from condemning him personally and expressed its approbation of his Order of Flora; but notwithstanding this the monks found themselves derided and insulted as the followers of a heretic, until, in 1220, they procured from Honorius III. a bull expressly declaring that he was a good Catholic, and forbidding all detraction of his disciples.[15]