Aijalon in the Bible Encyclopedia - ISBE

a'-ja-lon ('ayyalon, "deerplace"; the King James Version, Ajalon (Josh 10:12)): (1) The name of a town allotted to the tribe of Dan (Josh 19:42), which was also designated a Levitical city (Josh 21:24), which fell to the Sons of Kohath (1 Ch 6:69). The first mention of Aijalon is in the narrative of Joshua's defeat of the five Amorite kings: "thou, Moon, in the valley of Aijalon" (Josh 10:12). The Danites failed to take it from the Amorites (Jdg 1:35), although the men of Ephraim held it in vassalage. Here Saul and Jonathan won a great victory over the Philistines (1 Sam 14:31). At one time it was held by the tribe of Benjamin (1 Ch 8:13). Rehoboam fortified it against the kingdom of Israel (2 Ch 11:10). In the days of King Ahaz it was captured by the Philistines (2 Ch 28:18). It has been identified with the modern Yalo; its antiquity goes back to Tell el-Amarna Letters, in which it has mention. It Is situated Northwest of Jerusalem in a valley of the same name, which leads down from the mountains to the sea. (2) A town in the tribe of Zebulun, site unknown, where Elon the judge was buried (Jdg 12:12).

Link: https://bible-history.com/isbe/A/AIJALON/