The New Testament site of Antipatris was known as Aphek in Old Testament times. It is the place where the Philistines were encamped when they took the ark of the covenant from the Israelites who had camped at nearby Ebenezer (1 Samuel 4:1).
Antipatris was built by Herod the Great and named in honor of his father Antipater.
Because Aphek/Antipatris sat on a major south-north and west-east routes, it was dominated by many nations. The dominant feature of the site today is the Turkish fort. Inside are the excavated ruins of buildings from Canaanite to Herodian/Roman times.
Aphek/Antipatris is known by the modern name Ras el-Ain because it is located at the source of the Yarkon River which flows a few miles into the Mediterranean.
When a plot was raised against Paul while he was in the Fortress of Antonia in Jerusalem, he was sent by night to Antipatris. The next day he was escorted to Caesarea Maritima. Luke records the event,
So the soldiers, according to their instructions, took Paul and brought him by night to Antipatris. And on the next day they returned to the barracks, letting the horsemen go on with him. When they had come to Caesarea and delivered the letter to the governor, they presented Paul also before him. (Acts 23:31-33 ESV)
From Jerusalem to Antipatris is about 30 miles. From there to Caesarea Maritima is an additional 27 miles.
Paul would remain in custody at Caesarea Maritima for two years. We probably realize that the wheels of power often turn slowly.
The map below is used courtesy of BibleMapper blog.