The Dome of the Main Sacristy of Seville: The Foundation Stone that Redefined the Renaissance in Andalusia

Pioneering the adoption of the domed model in southern Spain (1535-1542), Martín de Gaínza’s work differs from that of Italy in its use of stone, guaranteeing solidity for its sculptural program and its direct exposure to the elements.

The design and construction process of the Dome of the Main Sacristy of the Cathedral of Seville, carried out between approximately 1535 and 1542, is considered a key episode for understanding the phenomenon of the use of the dome as an emblematic form of the Renaissance in Andalusia.

This project was the first attempt in Seville to introduce the domed model without formal or geographical precedents that could be located in the city. At the territorial level, the Seville dome is closely linked to previous experiences, initiated in part and subsequently executed, around the religious works of the architect from Burgos based in Granada, Diego de Siloé.

Typologically, the dome derives from the pantheonic model, a reference in the Spanish Renaissance prior to the construction of El Escorial. Siloé had already taken up this model literally in the rotunda of the Imperial Chapel of the Cathedral of Granada (from 1528).

However, the Seville Main Sacristy introduced a crucial innovation. While the Pantheon and Siloé’s works in Granada used the hemispherical dome on a cylindrical substructure, the Seville Sacristy was the first Spanish example where a hemispherical dome was articulated on a square matrix base. This articulation was achieved by a system of cruciform pillars joined by four transverse arches.

One of the most unique and decisive characteristics of the Seville dome is its systematic and almost exclusive adoption of heavy stone as a construction material.

The Dome of the Main Sacristy of Seville is like an imposing stone galleon whose massive construction is designed to withstand time and the elements without a roof, carrying on board the heavy load of its own iconography, which requires its structure to be of formidable thickness and resort to external reinforcements (the flying buttresses) to maintain its integrity under constant pressure.

In Italy, the construction technique tended to be relatively light, using stone more selectively and combining it with other materials such as brick, plaster or metal. This light approach facilitated the construction of high light bodies, but at the cost of a certain discontinuity and vulnerability in the work.

In contrast, the architecture of the Spanish Renaissance, and particularly that of Seville, was based on a widespread technique of cutting and working stone. The worked stone represented the sine qua non condition for a work to be considered “hecha al romano” (made in the Roman style), adding value and ensuring perpetuity.

This massive consistency was indispensable for two main reasons:

1. Sculptural Support: The dome required a sufficient section to support a vast iconographic program of the Last Judgment, developed in three annular sections (Hell, Purgatory and Heaven) and which included more than sixty characters and figures in relief of a size greater than life size. The Seville material uniformity was consistent with the need to have the stone as a constructive support to materialize the iconographic programs.

2. Durability and Exterior Exposure: The “Seville mode” required the membrane to be thick enough to avoid mechanical problems of stability and, crucially, water tightness.

The Andalusian Style: From Heaviness to Flying Buttresses

Martín de Gaínza, master of works of the cathedral since 1535, was forced to build an excessively heavy dome, an unprecedented experience in the Andalusian field.

The direct consequence of this very particular configuration was the need for an external apparatus. To manage the enormous thrusts that the heavy dome transmitted around it and prevent it from opening through its lower third, the use of flying buttresses and abutments was required. Eight slender flying buttresses act as struts for the lantern, and eight large pinnacles and other filling elements help to redirect the thrusts within the base of the vertical closing walls.

The result of this fusion of the Renaissance form (brought from Italy via Siloé) and the Andalusian constructive tradition of massive stone was a self-sufficient and very solid structure, but one that required Gothic solutions, such as flying buttresses, to support its weight, thus defining a pioneering and particular Andalusian style.

SCULPTURAL GROUP OF THE CENTRAL DOME

The Last Judgment has been represented in it. In the lower ring appear the condemned, among the flames of hell, tormented by demons. The following circle represents glory, in which twelve figures appear among cherubs in an attitude of prayer that may allude to the tribes of Israel or the apostles, according to Alfredo Morales. According to other authors, it would be the Purgatory, where the souls ascend to Paradise through prayer.

In the third ring is Christ the judge seated on the throne, with the world at his feet and a branch of lilies on one side of his head and a sword on the other, alluding to his mercy and justice, respectively. He is accompanied by the Virgin, Saint John, five blessed ones and the seraphim. Above, in the lantern, God the Father appears contemplating the scene, manifesting his condition as Supreme Being and pointing out the resurrection, the triumph and the glory of the chosen ones.