What the Baroque vaults were covering

By 1880 the chapel was a stack of layers, and the oldest were out of sight. Baroque vaults had been laid over the caliphal structure of the chapel[4], and a Baroque altarpiece filled the end wall.
Some people already knew what lay behind them. In 1875 Rodrigo Amador de los Ríos, accompanied by the architect Rafael de Luque y Lubián, was aware of the wall paintings[5]. The paintings were not news. What was missing was a reason to open the chapel up.
A word on dates, since this chapel's are easy to muddle. The cathedral credits its Gothic nave to Bishop Íñigo Manrique, between 1486 and 1496[6], decades before Charles V's 1523 nave, and dates the frescos of the earlier main chapel to 1351[7]. Never 1371: that year belongs to the Royal Chapel, finished under Enrique II of Trastámara[8], which rose behind al-Hakam II's old skylight bay, the former main chapel at the end of the Villaviciosa nave[9].

A grant, an architect and a bishop's altarpiece

A grant of 100,000 pesetas to restore Córdoba Cathedral was secured in December 1878[2]. Works under the architect Rafael de Luque y Lubián began six months later[10].
That is the money and the machinery behind 1880. The Mezquita-Cathedral was a building site, and the Villaviciosa chapel was one corner of it.
Interior of the Mezquita-Catedral de Córdoba with its iconic red-and-white arches and forest of columns

Explore nearby · Monument

Mezquita-Catedral de Córdoba

856 columns, 1,300 years of Islamic and Christian history. UNESCO monument in Córdoba, Andalusia. Red-and-white arches, Byzantine mosaics, a Renaissance nave.

Between 1879 and 1881 the chapel's religious furnishings were cleared out. The central altarpiece went to the church of Jesús Crucificado[11].
The bishop's part needs stating carefully. Fray Ceferino González encouraged the restoration. No source credits him with finding anything.

October 1880: the altarpiece comes down and a vault follows

Restoring the altarpiece meant dismantling it first.
Taking it apart brought down the lath-and-plaster Baroque vault[12]. Behind it stood the Islamic ceiling, together with Gothic paintings and interlaced arches. A repair to a piece of church furniture had turned into an excavation of the building.
The result was not a quiet one. The study names a second architect, Felipe Saínz de Varanda, as director of the intervention on the ceiling and calls it highly controversial[13]. The cited passage does not spell out the objections.
The timeline is short and crowded, which is why it is worth setting out.
Timeline
  1. 1351

    Fresco cycle

    Painted in the original main chapel, per the cathedral.

  2. 1486-96

    Gothic nave

    Bishop Íñigo Manrique builds it.

  3. 1875

    The paintings are known

    Amador de los Ríos and Luque are aware of them.

  4. 1879

    Works begin

    Luque's repairs start six months after the grant.

  5. Oct 1880

    Plaster falls

    The altarpiece is dismantled and a Baroque vault collapses.

  6. 1880

    Mural cycle disappears

    Painted walls are gone by year's end.

  7. 1907

    Velázquez Bosco project

    Per the Academia inventory, the major artistic restoration project begins.

The mural cycle that disappeared the same year

The wall paintings were the casualty. The cycle, made in the middle of the 14th century, held a triumph of Saints Peter and Paul and a series of Castilian kings around the high walls. It disappeared in 1880[14].
Disappeared is the careful word. None of the accounts names who removed the paintings, or on whose orders.
The cathedral lists a single survivor: a Head of Christ, on display in the Museo de Bellas Artes in Córdoba[3].
A study on Dialnet adds a storage chapter. What was kept sat in the Seminario de San Pelagio until 1939, when Bishop Adolfo Pérez Muñoz deposited it in the museum[15]. The cathedral counts one head; the study speaks in the plural. The two accounts do not obviously agree on how much survived.

What one repair gave and took

The 1880 work did not finish the job. The Real Academia de San Fernando's drawing inventory dates the most significant artistic restoration project for the chapel to 1907, under Velázquez Bosco[16].
The cathedral's page credits him with a different find: the wooden gabled roof of Bishop Manrique's Gothic nave, which he "discovered and recovered" in the 20th century after it had stayed hidden under vaults since the Modern Age[17]. The same page describes that gabled roof as coffered, with painted plant decoration and Latin and Greek inscriptions referring to "Jesus the Saviour"[18].

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That timber roof is a separate object from the Islamic ceiling exposed in 1880. The Academia's inventory says Baroque vaults covered the caliphal structure[4], and separately describes the chapel's ribbed (gallonada) vault, built around 960[19]. A collapse in one year revealed a layer, the painted walls went missing in the same year, and later campaigns worked with what remained. For the wider story of the building, see the Mezquita's mosque-to-cathedral history.
Interior of the Córdoba Synagogue at Calle de los Judíos, Mudéjar stucco arches and women's gallery with Hebrew inscriptions visible on upper walls, warm directional light, photorealistic

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The Córdoba Synagogue's Five Lives Since 1315

Built in 1315 as a private yeshiva, the Córdoba Synagogue survived pogroms, became a rabies hospital, then a cobblers' chapel, before rediscovery in 1885.

One question stays unanswered: who took the paintings down. The Head of Christ is what the cathedral says remains.