The human occupation of this territory began in the neolithic period, with small communities farming and cattle raising. The Roman civilization had an important influence in these lands leaving a rich patrimonial legacy.
During the Middle Ages there existed in the territory of the present council two different population nucleus, the Villa of Monforte and the Villa of Assumar.
The first Letter of charter was granted in 1257, by D.Afonso III, to the Villa of Monforte. It would be it given new letter of charter on July 1, 1512, by D. Manuel I. In 1281, D. Dinis offered it to its daughter D. Isabel, as gift of its marriage. In 1455, the Villa of Monforte entered in the ownership of the territorial domain of Bragança's House, through the donation done by D. Afonso V to the count of Arraiolos. The toponym derives of fortified hill or of fort, where the village seems to have had origin.