[Illustration: The Burning of S. Paul's, July 15, 1823. (From an old print.)] The name of Pope Siricius, who was then governing the church, can still be seen engraved on one of the columns, formerly in the left aisle, now in the north vestibule:-- SIRICIVS EPISCOPVS Α[Symbol: Chi-Rho]Ω TOTA MENTE DEVOTVS. Another rare monument of historical value, in spite of its humble origin, came to light at the beginning of the last century, and was published by Bianchini and Muratori, who failed, however, to explain its meaning. It is a brass label once tied to a dog's collar, with the inscription "[I belong] to the basilica of Paul the apostle, rebuilt by our three sovereigns [Valentinianus, Theodosius, and Arcadius]. I am in charge of Felicissimus the shepherd." Such inscriptions were engraved on the collars of dogs, and slaves, so that in case they ran away from their masters, their legal ownership would be known at once by the police, or whoever chanced to catch them. In course of time the basilica became the centre of a considerable group of buildings, especially of monasteries and convents. There were also chapels, baths, fountains, hostelries, porticoes, cemeteries, orchards, farmhouses, stables, and mills. This small suburban city was exposed to a constant danger of pillage, on account of its location on the high-road from the coast. In 846 it was ransacked by the Saracens, before the Romans could come to the rescue. For these considerations, Pope John VIII. (872-882) determined to put the church of S. Paul and its surroundings under shelter, and to raise a fort that could also command the approach to Rome from this most dangerous side.