The epistle to the Church at Philadelphia. The circuit continues in the same direction. Philadelphia lies about thirty miles south-east of Sardis, on the road to Laodicea. It is said to owe its name to Attalus Philadelphus, King of Pergamum, B.C. 159-138. But it is by no means certain that he was the founder. A trustworthy tradition as to its Egyptian origin points to Ptolemy Philadelphus, who had estates in Asia Minor (Theocr., 17.88). Lying at the western edge of a district whose highly volcanic character earned it the name of Phrygia Catacecaumene, Philadelphia was constantly suffering from earthquakes (cf. Revelation 3:12). It was destroyed along with Sardis in the catastrophe of A.D. 17 (Tac., 'Ann.,' 2.47). But the advantages of its position, commanding the way to the pass between the Hermus valley and the Maeander valley, and the richness of its vine produce (Virgil, 'Georg.,' 2.98), seem to have induced the inhabitants to cling to the site. The coins of Philadelphia often have the head either of Bacchus or a Bacchante on one side; and it is a known fact that volcanic soil is specially favourable to vine growing. Yet in Roman times it was not equal to Ephesus or even Laodicea; and for law courts its citizens had to go to Sardis. Nevertheless, it has outlived all these three, and still continues on the same site, and perhaps within the same walls, as of old. At the close of the fourteenth century it was the last Byzantine city to surrender to the Turks, and, when it did succumb, made better terms than any of the others. To this day it retains the privilege of free Christian worship, with the use of bells for service, and processions in public—a thing allowed by the Turks in no other inland city of Asia Minor. It has a bishop and a dozen churches, and it is said that about a third of its fifteen thousand inhabitants are Christian. Its modern Turkish name is Allah Shehr, "the city of God," or, as others write and render it, Ala Shehr, "the striped city." In any case the coincidence with "the name of the city of my God" (Revelation 3:12) is purely accidental. (For an eloquent account of Philadelphia, see Gibbon, 'Decline and Fall,' Revelation 64.)
It is doubtful whether there are any local allusions in the epistle; but some have fancied that "thou hast a little power" (Revelation 3:8) and "a pillar in the temple" (Revelation 3:12) are such (see notes in each place). The name of "Little Athens," which Philadelphia sometimes bore, on account of its numerous temples and festivals (Acts 17:16, Acts 17:22), shows that the little Christian community would have to contend with a specially vigorous form of heathenism. It had also to contend with a colony of hostile Jews, which was no doubt largely augmented after the destruction of Jerusalem, when fugitive Jews came to "worship before the feet" of the Philadelphian Church (Revelation 3:9). Hence the epistle of Ignatius to the Philadelphians treats of Judaism as one of their chief dangers (c. 6., 8., 9.). There were men among them who questioned the authority of Gospels and Epistles, and admitted only the Old Testament Scriptures ( τὰ ἀρχεῖα) as binding. Some had tried to lead even Ignatius himself astray (7.). Altogether his epistle gives a less happy picture of the Philadelphians than that which we have here, where (as in the epistle to the Church at Smyrna) the Philadelphian Church receives unmixed praise. Whether the large proportion of Old Testament language and imagery which is found in this epistle has any connexion with the Jewish colony in Philadelphia is uncertain. Perhaps most of the Christians had been originally Jews.