Philadelphia (fĭl'a-dĕl'fi-a), brotherly love. Revelation 3:7. A city on the borders of Lydia and Phrygia, about 25 miles southeast of Sardis. It was built by Attalus Philadelphus, king of Pergamos, who died b.c. 138. Philadelphia is mentioned in the New Testament as the seat of one of the seven churches. Revelation 1:11; Revelation 3:7-13. The church at this place was highly commended, and it is noticeable that the city has survived all the vicissitudes of earthquakes and wars until the present day.