Troas was at this time the termination of St. Paul's Asiatic travels. He had passed diagonally right through Asia Minor, following the great Roman roads which determined his line of march. From Troas he proceeded to Philippi, and for exactly the same reason. All the great roads formed under the emperors down to the time of Constantine the Great led to Rome. When the seat of empire was moved to Constantinople, all the Asiatic roads converged upon that city; but in St. Paul's day Rome was the world's centre of attraction, and thither the highways all tended. This fact explains St. Paul's movements. The Egnatian Road was one of the great channels of communication established for State purposes by Rome, and this road ran from Neapolis, where St. Paul landed, through Philippi on to Dyrrachium, a port on the Adriatic, whence the traveller took ship to Brundusium, the modern Brindisi, and thence reached Rome. What a striking commentary we find in this simple fact upon the words of St. Paul in Galatians iv. 4: "When the fulness of the time came God sent forth His Son." Roman dominion involved much suffering and war and bloodshed, but it secured the network of communication, the internal peace, and the steady, regular government which now covered Europe as well as Asia, and thus for the first time in the world's history rendered the diffusion of the gospel possible, as St. Paul's example here shows. The voyage from Troas to Neapolis was taken by the Apostle after the usual fashion of the time.[142] Neapolis was the port of Philippi, whence it is distant some eight miles. Travellers from the East to Rome always landed there, and then took the Egnatian Road which started from Neapolis. If they were official persons they could use the public postal service, post-houses being established at a distance of six miles from one another, where relays of horses were kept at the public expense, to carry persons travelling on the imperial service.[143] Paul and Silas, Timothy and Luke, must, however, have travelled on foot along the Egnatian Road from Neapolis to Philippi, which was their first objective point, according to St. Paul's usual policy, of attacking large and important centres of population, and then leaving the sacred leaven to work out into the surrounding mass of paganism. Philippi amply rewarded the wisdom of his plan, and the Philippian Church became notable for its zeal, its faith, its activity, among the Churches which owed their origin to the Apostle, as we learn from the Epistles addressed to the Corinthians and to the Philippians themselves a short time after the foundation of the Philippian Church.