Revelations. See Revelations 1:4 "John to the seven churches which are in Asia: Grace be unto you, and peace, from him which is, and which was, and which is to come; and from the seven Spirits which are before his throne;" (King James Version).
Paul in the epistles, and John writes to the seven churches in Asia Minor.
John was said to have founded the seven churches in Asia Minor.
Philadelphia in the Bible refers to a city in Asia Minor (modern-day Turkey) that was one of the seven churches mentioned in the Book of Revelation. The city is commended for its faithfulness despite facing persecution and is promised protection from future trials. The mention of Philadelphia in the Bible serves as a message of encouragement for believers to remain steadfast in their faith.
Asia Minor or Anatolia.
In Asia Minor (modern Turkey) and in the Middle East (modern Lebanon, Israel and Palestine).
THey were all churches in Asia Minor. Christ selected these seven churches to illustrate the spiritual conditions possible until He returns.
Paul stared churches such as Antioch, Corinth and so on.
The seven churches of Revelation are located in what is modern-day Turkey.
John addressed the book of Revelation to seven churches in Asia Minor: Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia, and Laodicea.
In the King James versionseveral mentions are made of "the seven churches which are in Asia"....Rev 1:4 John to the seven churches which are in Asia: Grace be unto you, and peace, from him which is, and which was, and which is to come; and from the seven Spirits which are before his throne;
John introduces Revelation as a letter to the seven Christian churches of Asia Minor. He states that it is a revelation given to him by Jesus Christ through an angel.
it might be that they both had something both needed to know