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Since the Byzantine Period, the Byzantine borders of "Palaestina" ("I" and "II", also known as "Palaestina Prima", "First Palestine", and "Palaestina Secunda", "Second Palestine"), have served as a name for the geographic area between the Jordan River and the Mediterranean Sea. Under Arab rule, "Filastin" (or "Jund Filastin") was used administratively to refer to what was under the Byzantines "Palaestina Secunda" (comprising Judaea and Samaria), while "Palaestina Prima" (comprising the Galilee region) was renamed "Urdunn" ("Jordan" or "Jund al-Urdunn").