The "Philadelphia Prophecy" is found by discovering that this name is connected in the Scriptures. The ancient city of Rabbah was later renamed Philadelphia which becomes a type of Jerusalem. The Philadelphia in Asia Minor also is associated with David by having the "Key of David". And we will have the Philadelphia Assembly with a high priest (and the Key of David) to also be located in Gentile lands (or islands) of the East. Another connecting thread is all three Philadelphia's are cities of water. Historically Rabbah was a city of water. Philadelphia in Asia Minor also was known for its mineral springs of water, and the future Philadelphia in the East will also have this connection. I believe this may be the City of Bislig located in the islands of the Philippines. This is because the City of Bislig has the Tinuy an Falls. Many call this wonder of nature the Niagara Falls of the Philippines.