In 1234, the future conquerors of the island, Guillermo de Montgrí, Peter of Portugal and Nuno Sanç, signed an agreement stipulating that establishing a parish dedicated to Saint Mary would be one of their first obligations upon conquest. As a result, the parish was established once the City of Eivissa was taken on August 8, 1235. At first worship took place in an already-existing building, perhaps a Muslim mosque adapted for use by Christians.
The existing structure is the result of numerous changes to the original building, including additions to the east side that include a trapezoidal bell tower and a polygonal apse with its five chapels. It is a very solid building, built in the Catalan Gothic style in the 16th century.
In 1435, the church had five chapels, dedicated to Saint James and Saint Michael, to Saint Tecla and Saint Anthony, to Saint John Baptist and Saint John Evangelist and to Saint Peter and Saint Paul. A new nave was built at the end of the 15th century, finished of
