The region has a long history of habitation found in archaeological sites from prehistory, Dacia and Roman period. The name Almăj is most likely from old Slavic describing the hills . There are few documentary references from the 13th and 14th centuries  when the region was predominantly under Hungarian rule following the capture of the Bulgarian fortress of Severin. These references are to Romanian nobles of the Almăj and Mehadia districts  and from the 13th century the mountain regions were part of the Hungarian border province “Banate of Severin” incorporating Romanian knez. Though the late 15th century there are references to eight villages (two remain with the same name) and the names of local estate nobles  and by the 16th century more of the current place names are recorded such as Mocerişul (1484), Putna (1500), Lăpuşnicul Mare (1540) .
Slavic linguist Emil Petrovici noted during his fieldwork the old Slavic base to the place names in Valea Almăjului, and significant Slavic loan words and phonetics in the Romanian dialect, however no existence or memory of any Slavic population . It seems the nobles and districts were Romanian by the 13th century. Although part of the Hungarian empire there are no Hungarian villages in Valea Almăjului, one informant commented that there was one village of Hungarian people, but the Hungarians left their village before the invasion of the Turks .
Within memory there has been further immigration of Romanians into the valley, but the continuing customs and culture appears to have more affinity with the mountain regions of Mehedinți and north-east Serbia (the “Vlach” Romanian speaking population) than to imports from other areas of Romanians.
- Gaga, Lidia (1984). Zona Etnografică Almăj, București, Editura Sport Turism.
- Marin, Irina (2009). The Formation and allegiance of the Romanian military elite originating from the Banat military border. PhD Thesis, University College London.
- Buracu, Corilan (1941). "Cronica istorică a Almăjului." Grofsorean, Cornel (editor), Revista Institutului Social Banat-Crișana.33-46 Timișoara, Institutul Social Banat-Crișana.
- Almăjan, Ion Marin (2003). Tara Almăjului cercetări monografice realizate de echipa Institutului Social Banat-Crișana în anul 1939: Editura Mirton.
- Petrovici, Emil (1935). "Folklor din Valea Almăjului." Ion Cuceu, Ion Taloș and & ion Mușlea (editors), Anuarul Arhivei de Folklor III : pages 25-158. Academia Română Institutul "Arhiva de folclor a Academiei Romane".