A ducal commission, appointed to find a means for ending the interminable strife between the rival academic parties, entrusted Eck with the preparation of fresh commentaries on Aristotle and Petrus Hispanus.
Amongst them may be mentioned a history of the dispute with Palamas; biographies of his uncle and early instructor John, metropolitan of Heraclea, and of the martyr Codratus of Antioch; funeral orations for Theodore Metochita, and the two emperors Andronicus; commentaries on the wanderings of Odysseus and on Synesius's treatise on dreams; tracts on orthography and on words of doubtful meaning; a philosophical dialogue called Florentius or Concerning Wisdom; astronomical treatises on the date of Easter and the preparation of the astrolabe; and an extensive correspondence.
His principal work is a series of commentaries on five of the lyrical anthologies included in the miscellaneous Nikaya.
Nicolaus also wrote comedies and tragedies, paraphrased and wrote commentaries on parts of Aristotle, and was himself the author of philosophical treatises.
The earliest account is that contained in the Commentaries of Julius Caesar.
Beside the theological and political works above quoted, Occam wrote Summa Logices (Paris, 1488, Oxford, 1675) commentaries on Porphyry's Isagoge, on the Categoriae, De Interpretatione and Elenchi of Aristotle.
At the same place, too, he wrote Quaestiones Hebraicae on Genesis, 2 and a series of commentaries on Isaiah, Jeremiah, Ezekiel, Daniel, the Twelve Minor Prophets, Matthew and the Epistles of St Paul.
After his return from Persia Simplicius wrote commentaries upon Aristotle's De coelo, Physica, De anima and Categoriae, which, with a commentary upon the Enchiridion of Epictetus, have survived.
But he chanced upon some of Zwingli's works and Bullinger's commentaries on St Paul's epistles; and after some molestation in England and some correspondence with Bullinger on the lawfulness of complying against his conscience with the established religion, he determined to secure what property he could and take refuge on the continent.
Throughout these later commentaries a strong antipapal interest which identified the pope with the Antichrist holds a central place - a doctrine which, as we have seen, goes back historically to the immediate disciples of Joachim and like-minded Franciscans.