The Tower of Esporão is one of the most important towers built during the transition from the Middle Ages to the modern era. It is thought to have been built by Morgado Álvaro Mendes de Vasconcelos between 1457, the date he inherited the property, and 1490, the year he died. This is the conclusion of the historian José Pires Gonçalves, based on the architectural style and the location of the Tower.
Álvaro Mendes came from an increasingly influential family of nobles linked to the powerful House of Bragança, having earlier been a knight in the household of the Duke of Bragança and governor of the city of Évora.
The construction of the Tower of Esporão can therefore be seen as tangible proof of his aristocratic aspirations. As such, it represented a desire to assert the new lineage, an assertion that was customarily expressed by the building of a tower or keep, as a symbol of the family’s status in society.
The main purpose of such towers had originally been for housing; however, by the end of the 15th century, the towers that existed in Portugal would have been ill-suited to permanent occupation, as they were limited in size.
They may have also been used as safe refuges for people and goods in times of need. Above all, they were a symbol of lordship and military power.
The importance that medieval towers regained at the end of the Middle Ages can be seen in the above-mentioned Nossa Senhora dos Remédios Chapel: its existence not only indicated that their owners had begun to use them more, but also that the area where they were built had taken on a sacred-like importance.
With its quadrilateral form, the Tower of Esporão is unusual in its size, measuring 14.4 x 10.9 metres, and is relatively wider in comparison with other towers from before, or even of the same period.
In fact, this eventually served as a model for other towers, demonstrating the influence that the Tower of Esporão had on the construction of similar constructions in the Alentejo.