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Pulcheria, Saint Pulcheria, Saint- Empress of the Eastern Roman Empire, staunch opponent of Nestorianism and Eutychianism, d. 453. Proclus, Saint Proclus, Saint- Patriarch of Constantinople, disciple of St. John Chrysostom, and died in 446 or 447. Polycarp, Saint Polycarp, Saint- Long article on what we can know about St. Polycarp, from ancient sources. Martyred in 155. Porphyrius, Saint Porphyrius, Saint- Bishop of Gaza, died in 420. Pachomius, Saint Pachomius, Saint- Hermit who founded a cenobitical community, d. 346. Some speculation on how and why St. Pachomius came up with the idea of the cenobitical life. Paulinus, Saint, Archbishop of York Paulinus, Saint, Archbishop of York- Biographical article on the Roman monk sent by St. Gregory the Great to Kent. Perpetuus, Saint Perpetuus, Saint- Eighth bishop of Tours, d. 490 or 491. St. Perpetuus was greatly devoted to his predecessor St. Martin of Tours. Processus and Martinian, Saints Processus and Martinian, Saints- Martyrs venerated since the fourth century at the latest. Peter of Sebaste, Saint Peter of Sebaste, Saint- Brother of SS. Basil the Great, Gregory of Nyssa, and Macrina the Younger. Peter was bishop of Sebaste, and died in 391. Peter of Alexandria, Saint Peter of Alexandria, Saint- Became bishop of Alexandria in 300, and was martyred in 311. Pantaleon, Saint Pantaleon, Saint- Martyr, died in about 309. Pange Lingua Gloriosi Pange Lingua Gloriosi- Article on the two hymns of this name. The second is by Thomas Aquinas. The first is "generally credited" to Venantius Fortunatus, though some believe it is… Prudentius, Aurelius Clemens Prudentius, Aurelius Clemens- Biographical article on the poet. Pantheism Pantheism- (Catholic Encyclopedia) Paracelsus, Theophrastus Paracelsus, Theophrastus- Extensive biographical entry on the physician and alchemist. Population, Theories of Population, Theories of- (Catholic Encyclopedia) Pythagoras and Pythagoreanism Pythagoras and Pythagoreanism- Concise summary of doctrines attributed to Pythagoras. Pascal, Blaise Pascal, Blaise- (Catholic Encyclopedia) Plethon, Georgius Gemistus Plethon, Georgius Gemistus- (Catholic Encyclopedia) Pomponazzi, Pietro Pomponazzi, Pietro- Short article on the philosopher, by U. Benigni. Philo Judaeus Philo Judaeus- Article on his life, writings and doctrine, by Emile Brehier. Paulus Venatus Paulus Venatus- Brief article on this thinker, by Francis E. Tourscher. Pierre de Maricourt Pierre de Maricourt- Article on this 13th-century theorist of optics and magnetism, written by Pierre Duhem. Pragmatism Pragmatism- (Catholic Encyclopedia) Pertinax, Publius Helvius Pertinax, Publius Helvius- (Catholic Encyclopedia) Philip II Philip II- (Catholic Encyclopedia) Procopius of Caesarea Procopius of Caesarea- Biographical article providing an overview of the historian's life and major writings. Ponce de León, Juan Ponce de León, Juan- Concise biographical article on the explorer. Polo, Marco Polo, Marco- (Catholic Encyclopedia) Pizarro, Francisco Pizarro, Francisco- Concise biographical article on the explorer.