The construction of the Palace of San Jerónimo was ordered by the archbishop of Fonseca.

The palace of San Jerónimo, also known as Estudio Viejo was built in the 12th century, odered by the archbishop of Fonseca and, originally, it was not located in this square, but it was close to the San Martín Pinario's convent, in the north side of the Cathedral of Santiago de Compostela. Initially, it was a low-income students residence but, during the expansion of the monastery of San Martín, the benedictine monks bought it and expelled the students in order to devote it to worship and prayer. The new building was built at Obradoiro's square in the 15th century. Nontheless, it preserves the romanesque entrance of the old school which came from and old hospital located in the street of Azabachería. The hospital does not exist any more. This romanesque porch is deeply marked by the virgen and the apostles. Today it is deanship's main building of the University of Santiago de Compostela.