La Monzia (La Moinerie) is mentioned into documents of the 13th century, under the protection of Montastruc, fief of the Castrum of Montclar. In 1309, Hugues 1st d’Abzac, lord of Clerans and knight for Montclar, is benefiting from a donation of assets in La Monzia, including the “domus” of Montastruc.
In 1329, his son Hugues 2nd d’Abzac fortifies Montastruc over its antique existing bases. Rudel 4th de Mouleydier, lord and baron of Montclar, allows the works to be done and gets a solemn homage as suzerain, in the chapel of Lamonzie. Montastruc and the d’Abzac become from that moment a permanent threat for Montclar and its barons.
In 1437, the “Reppayrium de Monte Astruco” is mentioned as fief of Bertrand d’Abzac. On the 14th of February 1439, Amaury d’Estissac, heir of the châtellenie of Montclar, donates to Bertrand d’Abzac all the rights of high, mid and low justice that he could have over Montastruc, under the condition of a symbolic homage of a pair of white gloves. But Bertrand d’Abzac, is made prisoner after his invasion of the city of Domme, is beheaded in Limoges on the 1st of March 1439 by order of Charles 7th and the demolition Montastruc, to the height of the infamy (“à hauteur de l’infamie”) is undertaken following the criminal trial started in 1438 – however the destruction will be only partial.
In 1449, Jean of Bretagne returns to Jeanne de Beynac, widow of Bertrand d’Abzac, the estate of Montastruc against submission to the Royal authority. The castle is rebuilt from 1480, supported by royal decree (“Lettres patentes”) from Louis 11th dated September 1475.