The main nucleus of the Baronial Palace of Monteroni originated in the 14th century by the Montoroni family, feudal lords of the hamlet.
The façade retains the sloping angle of the original medieval building, designed to control the two roads that led to Arnesano and San Pietro In Lama.
The imposing portal, still visible today, consists of four columns with Corinthian capitals, surmounted by a frieze and the Gattinara coat of arms, to which was later added that of the Lopez y Royo family. On the sides, there are two medallions depicting a character with an imperial crown and a bicaudal siren. In 1665, two side complexes were built and the portal was embellished, attributed to Ambrogio Martinelli. In the first two decades of the following century, the long façade acquired its current formal definition, altered by a collapse in 1942, followed only by partial rebuilding.

At the beginning of the 17th century, it consisted of two floors: the lower floor was structured for the kitchen, with rooms for storage and a cellar, as well as a dining room.

Here we are in the ballroom, the palace's hall of honour, where an important marble plaque found in 1795 during the excavations at Rudiae, the birthplace of Quintus Ennius, currently stands.

This side of the upper floor consisted of bedrooms, living rooms and, most importantly, the gallery, one of the most majestic in the province. Here, the barons kept a remarkable picture gallery, which was dispersed together with the rich library.

There was also a chapel on the upper floor, initially dedicated to the Annunziata, and later, with the arrival of the Dukes Lopez y Royo, the new feudal lords, it was dedicated to St. Michael the Archangel. They enlarged the palace in the 16th century and transformed it into a noble residence with the typical stylistic features of Lecce Baroque.

A beautiful garden can be seen at the back of the palace, a site that has recently been the subject of archaeological excavations.