History
Brot-Dessous is first mentioned in 998 as Broch in a document celebrating the founding of the priory of Bevaix. Between 1524 and 1730 it was part of the municipality of Rochefort.
Geography
Brot-Dessous had an area, as of 2009, of 5 square kilometers (1.9 sq mi). Of this area, 0.62 km2 (0.24 sq mi) or 12.5% is used for agricultural purposes, while 3.92 km2 (1.51 sq mi) or 79.2% is forested.