The chapel of Santa Àgata was built by King James II of Catalonia and Aragon and his wife Blanca de Nápoles to be part of the Royal Palace and replace the old oratory that was in the palace.
The building manager Bertran Riquer was in charge of starting the construction. The project was continued in 1316 by Jaume del Rei and later by Pere d'Olivera. The construction continued under the reign of Peter the Ceremonious, who ordered to make the chapel of the Queens on the small cruise of the church, and later King Martin I the Humane performed the chapel that served as baptistry, at the feet of the ship His primitive dedication was in honor of Santa Maria, until the year 1601, when, given the custody of the relics of Saint Agatha, the papacy issued a bull for the change of invocation.
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