The "Adullam" mentioned in the Hebrew Bible is usually thought to be identical with Tell Sheikh Madkhur, that is, the archaeological ruin referred to in this article as "Adullam."

Adullam was one of the royal cities of the Canaanites referred to in the Hebrew Bible.
Although listed in Joshua as being a city in the plain, it is actually partly in the hill country, partly in the plain.
It stood near the highway which later became the Roman road in the  Valley of Elah, the scene of David's victory over Goliath.
It was here that Judah, the son of Jacob (Israel), came when he left his father and brothers in Migdal Eder, where he befriended a certain Hirah, an Adullamite, and where he met his first wife (unnamed in Genesis), the daughter of Shua.
It was one of the towns which Rehoboam fortified against Egypt.
Micah calls it "the glory of Israel."

King David sought refuge in Adullam after being expelled from the city of Gath by King Achish.
I Samuel refers to the Cave of Adullam where he found protection while living as a refugee from King Saul.
It was there that "every one that was in distress gathered together, and every one that was in debt, and every one that was discontented."
Certain caves, grottos and sepulchres are still to be seen on the hilltop, as well as on its northern and eastern slopes.

It was in Adullam that Judas Maccabaeus retired with his fighting men, after returning from war against the Idumaeans.
As late as the early 4th century CE, Adullam was described by Eusebius as being "a very large village about ten [Roman] miles east of Eleutheropolis."
The "Adullam" mentioned in the Hebrew Bible is usually thought to be identical with Tell Sheikh Madkhur, that is, the archaeological ruin referred to in this article as "Adullam." 
Adullam was one of the royal cities of the Canaanites referred to in the Hebrew Bible. Although listed in Joshua as being a city in the plain, it is actually partly in the hill country, partly in the plain. It stood near the highway which later became the Roman road in the  Valley of Elah, the scene of David's victory over Goliath. It was here that Judah, the son of Jacob (Israel), came when he left his father and brothers in Migdal Eder, where he befriended a certain Hirah, an Adullamite, and where he met his first wife (unnamed in Genesis), the daughter of Shua. It was one of the towns which Rehoboam fortified against Egypt. Micah calls it "the glory of Israel."
King David sought refuge in Adullam after being expelled from the city of Gath by King Achish. I Samuel refers to the Cave of Adullam where he found protection while living as a refugee from King Saul. It was there that "every one that was in distress gathered together, and every one that was in debt, and every one that was discontented." Certain caves, grottos and sepulchres are still to be seen on the hilltop, as well as on its northern and eastern slopes.
It was in Adullam that Judas Maccabaeus retired with his fighting men, after returning from war against the Idumaeans. As late as the early 4th century CE, Adullam was described by Eusebius as being "a very large village about ten [Roman] miles east of Eleutheropolis."
Adullam