Aialon vallis atque praeruptum, super quod orante quondam Iesu luna stetit iuxta villam quae usque nunc Aialon dicitur, contra orientem Bethelis, tribus ab ea milibus distans, haud procul a Gabaa et Rama, Saulis urbibus. Porro Hebraei affirmant Aialon vicum esse iuxta Nicopolim in secundo lapide pergentibus Aeliam.
Eusebius, Onomasticon 18:13-16 (ca. 295 A.D.); Jerome 19:13-17 (ca. 390 A.D.)
Aialon (Jos 10:12), a valley and gorge over which the moon stood still once upon a time in answer to Joshua's prayer, near the village now called Aialon 'Ailon', east of Bethel at a distance of three miles, not far from Gaba and Rama, cities of Saul. However, the Jews maintain that Aialon is a village near Nicopolis (Emmaus), at the second milestone on the road to Jerusalem.
Josh 10:10-14 The battle of Aijalon
The Lord threw them into a panic before Israel, who inflicted a great slaughter on them at Gibeon, chased them by the way of the ascent of Beth-horon, and struck them down as far as Azekah and Makkedah. 11 As they fled before Israel, while they were going down the slope of Beth-horon, the Lord threw down huge stones from heaven on them as far as Azekah, and they died; there were more who died because of the hailstones than the Israelites killed with the sword. 12 On the day when the Lord gave the Amorites over to the Israelites, Joshua spoke to the Lord; and he said in the sight of Israel, "Sun, stand still at Gibeon, and Moon, in the valley of Aijalon." 13 And the sun stood still, and the moon stopped, until the nation took vengeance on their enemies. Is this not written in the Book of Jashar? The sun stopped in mid-heaven, and did not hurry to set for about a whole day. 14 There has been no day like it before or since, when the Lord heeded a human voice; for the Lord fought for Israel.
2Chr 28:18 Philistines' conquests
The Philistines also had invaded the cities of the low country, and of the south of Judah, and had taken Beth-shemesh, and Ajalon, and Gederoth, and Shocho with the villages thereof, and Timnah with the villages thereof, Gimzo also and the villages thereof: and they dwelt there.
MORE ANCIENT SOURCES
Hieronymus, Ep.108 (Peregrinatio Paulae) 8 (385 A.D.)
Then, turning back along the way she had come, she reached Nicopolis. From this she passed on and climbed to Lower and Upper Beth-horon, cities which were founded by Solomon (2Chr 8:5), but later destroyed in the disasters of war; seeing on her right Aijalon and Gibeon, where Joshua the son of Nun fought against the five kings, and uttered his command to the sun and moon; and condemned the Gibeonites to become drawers of water and hewers of wood because of the deception by which they tricked him when they asked to become allies.