Ademuz was a territory dominated by the Bereber family of the Banu Qasi since the 8th century. W the caliphate of Cordoba was destroyed around the year 1009, the so-called Rincón de Ademuz became part of a small kingdom that incorporated much of the mountain range and the capital in Alpuente. The powerful family of the Banu Qasi, which ruled other kingdoms in the present Aragon, La Rioja and Navarra, would govern the area until the year 1104, when the family would be defeated by the Almoravids. It will be the Almohads who later dominated the area.
The Knights of the Order of St. Jorge, led by King Pedro II of Aragon, conquered the castles of Castielfabib and Ademuz in 1210. The conquering of Castielfabib was important to the king, and he summoned the Cortes General of Aragon that same year so that his nobles and ecclesiastics could prove the feat had been achieved. The king decided that Ademuz would be the royal town, while Castielfabib was entrusted to the Order of the Temple.
The Rincón de Ademuz was part of the Kingdom of Aragon until 1260, when it happened to belong to what used to be the Kingdom of Valencia. The origin of the current city dates back to the donation of King Jaime I, from the Arcos de las Salinas to the Council of Teruel on June 17, 1269. Since then, it has remained a Valencian territory.
In 1319, when the Knights Templar were removed, Castielfabib was handed over to the Order of Montesa, who set up a barony to administer the whole region, known as the Rincón de Ademuz.
The Rincón de Ademuz has caused numerous cartographic errors for centuries, appearing with the Kingdom of Valencia or other territories. Until the end of the eighteenth century, there was no correct representation of the area as an administrative enclave. During the nineteenth century, on two occasions, there were attempts to dissociate Ademuz from Valencia, but the attempts were unsuccessful. The decree of King Joseph I on April 17, 1810, included the Shire in the Prefecture of Alto Guadalaviar. The return of the Bourbons prevented a forced entry.
With the new provincial division of 1812, the Rincón became part of the province of Teruel. Power was returned to the absolutists in 1823. The territorial boundary of the region remained unchanged during these times.