Page "Simplicius of Cilicia" Paragraph 6

The commentary on de Caelo was written before that on the Physica Auscultatio, and probably not in Alexandria, since he mentions in it an astronomical observation made during his stay in that city by Ammonius.

Simplicius wrote his commentary on the Physica Auscultatio after the death of Damascius, and therefore after his return from Persia.

When it was that he wrote his explanations of the Categories, whether before or after those on the above-mentioned Aristotelian treatises, it is impossible to ascertain.

Besides these commentaries of Simplicius which have been preserved, the de Anima commentary mentions explanations on the metaphysical books, and an epitome of the Physica of Theophrastus.