While teaching, Zimmern produced a school edition of the Meditations of Marcus Aurelius in 1887, a translation of Hugo Bluemner's The Home Life of the Ancient Greeks (1893), and a translation of Porphyry: The Philosopher to his Wife Marcella (1896).
Porphyry states that on one occasion at Edessa, Bardaisan interviewed an Indian deputation of holy men (designated as Σαρμαναίοι, Sramanas) who had been sent to the Roman emperor Elagabalus or another Severan dynasty Roman Emperor, and questioned them as to the nature of Indian religion.
His nickname alludes to the Purple Room of the Imperial palace, decorated with porphyry, where legitimate children of reigning emperors were normally born.
The Neoplatonist philosopher Porphyry of Tyre (c. 232–c. 304) authored the 15 volume treatise Against the Christians, proscribed by the Emperors Constantine and Theodosius II, of which only fragments now survive and were collected by Adolf von Harnack.
The Ffestiniog region contains five major slate veins, which are on top of a thick layer of feldspathic porphyry, called the "Glanypwll Trap".
Another work of some importance, Anecdota Graeca (1781), from the Paris and Venice libraries, contains the Ionia (violet garden) of the empress Eudocia, and several fragments of the Neoplatonists Iamblichus and Porphyry, Procopius of Gaza, Choricius, and the Greek grammarians.
His library can at least partially be reconstructed: Archimedes, Euclid, Plato, Paul of Alexandria, Theon of Alexandria, Proclus, Porphyry, Apollonius of Perga, the lost Mechanics of Quirinus and Marcellus, and possibly Thucydides.
These fragments are apparently drawn from the lost "Words against the Christians" of Porphyry or from the "Truth-Loving Words" of Hierocles.
The Pythagorean tradition considered the "founder" of their order to have studied with Zoroaster in Chaldea (Porphyry Life of Pythagoras 12, Alexander Polyhistor apud Clement's Stromata I.15, Diodorus of Eritrea, Aristoxenus apud Hippolitus VI32.2).
Stobaeus, in his Eclogae, preserves a fragment of his writings; further extracts survive in the form of quotations in Porphyry's Life of Pythagoras and Simplicius's commentary on Aristotle's Physics.
Important deposits include the disseminated porphyry molybdenum deposits at Questa, New Mexico and the Henderson and Climax mines in Colorado.
The Neoplatonism of Plotinus and Porphyry has been referred to as in fact being orthodox Platonic philosophy by scholars like John D. Turner.
Set along one of the walls is the porphyry and bronze sarcophagus of Giovanni and Piero de' Medici by Verrocchio.
Sergius also translated various other works, including the Categories of Aristotle, Porphyry's Introduction to the Categories and theological works by Pseudo-Dionysius the Areopagite.