Palace of Maximian Herculius, Roman imperial palace ruins in Córdoba Province, Spain

The Palace of Maximian Herculius is a Roman monumental complex at the Cercadilla site, northwest of Córdoba's old centre. Its core was a semicircular portico 109 m across enclosing an open courtyard, with rooms radiating outward and a large reception hall of 48.5 × 22.5 m at the centre; only foundations and the cryptoporticus remain.

The palace complex at Cercadilla was uncovered in 1991 during rescue excavations ahead of the new Córdoba railway station. Its construction is dated to around 300 CE, and some researchers link it to Emperor Maximian, who stayed briefly on the Iberian Peninsula in 296/297; others attribute it to the governor of Baetica or Bishop Ossius. From the 6th to the 10th/11th century part of it served as a Christian cult and burial site, where the tomb inscription of Bishop Lampadius was found.

The complex served as a Christian worship space by the 6th century, with remains of cemeteries showing how the site was repurposed for new religious practices. This transformation reflects how the place changed meaning for different communities over time.

The site lies a few hundred metres outside the ancient walls of Córdoba, next to the city's main railway station, whose construction led to its excavation in 1991. Much of the complex was destroyed by bulldozers in 1992, so remains are fragmentary and partly built over. Check locally which sectors can be seen before travelling.

The site was found in 1922, and in 1992 bulldozers destroyed much of it while archaeologists tried to stop the work for Córdoba's new AVE station. Two bishops, Lampadius and Samson, were identified among the burials of the later Christian necropolis.