[2] During the 19th and first half of the 20th century, Ayn al-Mansi was one of the settlements of the so-called "Fahmawi Commonwealth" established by Hebronite clans belonging to Umm al-Fahm.

The Commonwealth consisted of a network of interspersed communities connected by ties of kinship, and socially, economically and politically affiliated with Umm al Fahm.

[5] In the 1882 the PEF's Survey of Western Palestine (SWP) described El Mensi as: "A small ruined village, with springs.

"[6] In the 1931 census of Palestine, conducted by the British Mandate authorities, Ein el Mansi had 73 Muslim inhabitants, in a total of 15 houses.

[7] In addition to agriculture, residents practiced animal husbandry which formed was an important source of income for the town.