 Rehoboam, the first king of Judah, fortified the city of Aijalon, supplying officers, weapons and food provisions ().Ajalon's identification with Yalo was made by Edward Robinson during his travels in Palestine in 1838.Using the works of Jerome and Eusebius of Caesarea, who describe Aijalon as being two Roman miles from Nicopolis, while also drawing upon descriptions of Aijalon in the Old Testament and noting the philological similarities between the Arabic name and its Hebrew root, Robinson concluded that the Yalo was indeed Aijalon.