Brethren - Christian brethren. But by whom the gospel had been preached there is unknown.

Where we found brethren - That is, Christians; for there had been many in Italy converted to the faith of Christ, some considerable time before this, as appears from St. Paul's epistle to the Romans, written some years before this voyage.
We went toward Rome - One of the most celebrated cities in the universe, the capital of Italy, and once of the whole world; situated on the river Tiber, 410 miles SSE. of Vienna; 600 SE. of Paris; 730 E. by N. of Madrid; 760 W. of Constantinople; and 780 SE. of London. Long. 12. 55'. E., lat. 41. 54'. N. This famous city was founded by Romulus, at the end of the seventh Olympiad, a.m. 3251; of the flood, 1595; and 753 years before the Christian era. The history of this city must be sought for in works written expressly on the subject, of which there are many. Modern Rome is greatly inferior to ancient Rome in every respect. Its population, taken in 1709, amounted to 138,569 souls only; among whom were 40 bishops, 2686 priests, 3359 monks, 1814 nuns, 893 courtezans, between 8 and 9000 Jews, and 14 Moors. This city, which once tyrannized over the world by its arms, and over the whole Christian world by its popes, is now reduced to a very low state among the governments of Europe, by whom it is supported, for it has no power sufficient for its own defense.

(8) Where we found brethren, and were desired to tarry with them seven days: and so we went toward Rome.
(8) God bows and bends the hearts even of profane men, as it pleases him to show favour to his own.

Where we found brethren,.... Christians; which is not to be wondered at, since it was a port much frequented, and where many came and went, of different countries and nations; particularly there were many Jews here, to whom the Gospel was first preached, and to some of them it was the power of God unto salvation in many places, and doubtless was so here: Josephus (c) speaks of Jews in this place, who were deceived by a false Alexander, who pretended to be the son of Herod, a prince of their nation. Patrobulus, the same with Patrobas in Romans 16:14; who is reckoned one of the seventy disciples, is said to be bishop of this place; See Gill on Luke 10:1; though we have no account of its church state until the "fifth" century, when a bishop of the church at Puteoli is said to be in the council held at Ephesus against Eutyches, and sustained the place of Leo, pope of Rome: in the "sixth" century, a bishop of this church was in a council held at Rome, under Symmachus: in the seventh century, the bishop of Puteoli was in the sixth council at Constantinople (d):
and were desired to tarry with them seven days; that is, the Christians at Puteoli desired the apostle, and those that were with him, to stay a week with them, that they might have the advantage of a day of public worship together, and might enjoy much of their Christian conversation; and accordingly they did stay that time, no doubt by the leave, and with the consent of Julius the centurion; and which shows, that he used the apostle with great civility and courteousness, and was very ready to grant him favours; if he was not in this voyage converted by him, which is not unlikely, considering the whole of his conduct:
and so we went toward Rome; after they had stayed seven days at Puteoli, they set forward on their journey to Rome; for from hence they went thither on foot, though they might have gone from hence to Rome by sea, as Apollonius Tyaneus did; See Gill on Acts 28:13; and so likewise Titus the son of Vespasian, who went from Rhegium to Puteoli in a merchant ship, and from thence to Rome (e); but it may be the ship unloaded here, and there was no other going for Rome at that time: Rome was the metropolis of Italy, the seat of the empire, and mistress of the whole world; it is so well known, as not to need describing: it was built on seven hills, and had its name either from Romulus the founder of it; or from the Greek word which signifies "strength" (f), from whence Romulus is supposed to have his name; with the Hebrews it has its name from its sublimity, height, and glory, from the word which signifies to be high and exalted: some say it had its name from Roma, a daughter of Italus, who first laid the foundation of it, though Romulus and Remus brought it into the form of a city; it was built seven hundred and fifty years, and upwards, before the birth of Christ. The Jews make it to be of an earlier date; they say (g), that at the time Solomon married Pharaoh's daughter, Gabriel descended and fixed a reed in the sea, and brought up clay, and with it was built the great city, which is Rome; and in another place (h) it is said, in the day in which Jeroboam set up the two calves, one at Daniel, and the other at Bethel, was built a certain cottage, which is Italy of Greece, that is, Rome; for it is elsewhere observed (i), Italy of Greece, this is the great city of Rome; and again (k), on the day in which Jeroboam set up the two calves, Remus and Romulus came and built two cottages in Rome.
(c) Antiqu. l. 17. c. 14. sect. 1. (d) Magdeburg. Eccl. Hist. cent. 5. c. 2. p. 7. cent. 6. c. 2. p. 8. cent. 7. c. 2. p. 5. (e) Sueton. Vita Titi, c. 5. (f) Aur. Victor. Origo Gent. Romans. p. 233. (g) T. Bab. Sanhedrin, fol. 21. 2. (h) T. Bab. Sabbat, fol. 56. 2. (i) T. Bab. Megilia, fol. 6. 1. (k) T. Hicros. Avoda Zara, fol. 39. 3. Vid. Shirhashirim Rabba, fol. 6. 2.

Where we found brethren--not "the brethren" (see on Acts 21:4), from which one would conclude they did not expect to find such [WEBSTER and WILKINSON].
and were desired--"requested."
to tarry with them seven days--If this request came from Julius, it may have proceeded partly from a wish to receive instructions from Rome and make arrangements for his journey thither, partly from a wish to gratify Paul, as he seems studiously and increasingly to have done to the last. One can hardly doubt that he was influenced by both considerations. However this may be, the apostle had thus an opportunity of spending a Sabbath with the Christians of the place, all the more refreshing from his long privation in this respect, and as a seasoning for the unknown future that lay before him at the metropolis.
so we went toward Rome.