11 Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.
[AD 990] Oecumenius on Revelation 1:10-11
There are more cities in Asia than these, but he is commanded to write to those taught by him and who had received the faith of Christ. For those who did not believe and turned away from the saving word, how could anybody even advise them?

[AD 600] Apringius of Beja on Revelation 1:11
We have already said that he addressed one church which exists during the time of the whole world, that is, from that time when he spoke to the consummation of the world. Since he now mentions the names of these churches specifically, let us see what meanings they have.… There is a mighty mystery in the names which we will examine and discuss to the extent that God allows. Ephesus means “my will” or “my plan.” He wills that we know that the whole reality of our faith and the dignity of the catholic church is not to be ascribed to human merit, but they are the will of God and the disposition of the divine purpose. Smyrna means “their song.” And what else is the song of the perfect if not the celestial doctrine and the preaching of the gospel and the advance of the Christian religion, or the melodious confession of the catholic church? Pergamum means “to him who divides their horns.” This refers either to the insolence of the powers of the air, or to the arrogance of the heretics. And he teaches that the pride of the powers is always to be separated and divided from the congregation of the church, for the horns are either power or arrogance. He writes to Thyatira, that is “enlightened.” This signifies that, after the expulsion of heretical pride and after the defeat of temptations from the powers of the air, the holy church is deserving of the light of righteousness. Sardis means the “beginning of beauty.” The church is seized by the sun of righteousness and is illumined by the light of truth, so that she might have the beginning of beauty, the Lord Jesus Christ, and might always shine in perpetual light. Philadelphia means “preserving devotion to the Lord.” After possessing the sun of righteousness, after the illumination of holiness, after the comeliness of holy beauty, the church rightly is devoted to the Lord and preserves herself by an inviolable observation of devotion. Laodicea means either “a tribe beloved of the Lord,” or, as some would have it, “a birth is expected.” Both are meaningful, for she who has merited the beauty of faith and the sun of righteousness and knows that through faith the Lord cleaves to her, might also be a tribe whom the Lord loves, who is both loved by the Lord and preserved by the Lord. Furthermore, the church might well await her own birth, either the regeneration of baptism or the glory of the resurrection, whenever she preserves herself by humility and patience.

[AD 735] Bede on Revelation 1:11
And send to the seven churches, etc. The Church of Christ was not then only in these places, but the fullness consists in the number seven. Asia, which is interpreted as elevation, designates the proud height of the world in which the Church sojourns; and, as is the custom of divine mystery, the genus fits the species. For the Apostle Paul also writes to seven churches; not, however, the same as John. And although these seven places are a figure of the whole sevenfold Church, yet specific things happened in these which he reproaches or praises.