Comprehensive Restoration of the Royal Chapel at the National Palace of Sintra

Founded by King Dinis in the early fourteenth century and dedicated to the Holy Spirit, the Royal Chapel played a central role in the religious life of the Portuguese court for several centuries. It is one of the most important examples of Mudéjar artistic expression in Portugal, reflecting the synthesis of Christian and Islamic building traditions that characterised a significant part of the Iberian Peninsula’s heritage.

The alfarge ceiling, decorated with elaborate geometric interlacing patterns, is one of the few surviving examples of this type in Portugal. Likewise, the floor of alicatado tiles preserves important evidence of decorative techniques whose execution required a high level of craftsmanship.

Preserving these elements is particularly important for understanding the cultural influences that shaped the development of Portuguese artistic identity throughout the Middle Ages and the Early Modern Period.

One of the intervention’s main objectives is to ensure the monument’s long-term stability by mitigating the identified causes of deterioration.

To this end, the works include structural reinforcement, roof rehabilitation, improvements to drainage systems and the implementation of monitoring mechanisms to track the building’s state of conservation.

This approach prioritises preventive conservation, helping reduce the need for major interventions in the future and promoting the sustainable management of heritage through knowledge, monitoring and ongoing maintenance.

Beyond the physical conservation of the monument, the intervention will deepen historical understanding of the Royal Chapel and enhance its presentation and interpretation as a heritage site.

Restoring decorative surfaces, paintings, ceramic finishes and gilded elements will make the space more legible and reveal the richness of the colours and ornamentation that characterise this heritage complex.

Once the works are complete, visitors will be able to experience a clearer, more coherent interpretation of the Chapel, closer to its historical authenticity, and gain a fuller understanding of its religious, artistic and political significance within the context of the former Royal Palace of Sintra.

The project stems from a multidisciplinary research process carried out in collaboration with academic and scientific institutions specialising in the study and conservation of cultural heritage.

Four fundamental principles guide the intervention:

• Scientific research – intervention decisions are based on historical studies, material analyses and specialist assessments.
• Preservation of authenticity – safeguarding the historic materials and heritage values that define the monument.
• Integrated approach – coordinating the treatment of structural, architectural and decorative elements.
• Long-term monitoring – establishing the conditions needed to track changes in the building’s state of conservation after the works are completed.

The project directly contributes to several of Parques de Sintra’s strategic objectives for 2025–2027:

1. Distinctive cultural and tourism offer – providing a richer visitor experience and a deeper understanding of the monument’s history.

2. Understanding and restoring heritage – conserving and enhancing one of the most important artistic ensembles at the National Palace of Sintra.

3. Safeguarding the Cultural Landscape and UNESCO Heritage – preserving an integral part of a monument located within the Sintra Cultural Landscape.

5. Innovation, sustainability and quality management – applying scientifically grounded methods of research, monitoring and conservation.

This integrated programme of research, conservation and heritage enhancement at the Royal Chapel of the National Palace of Sintra aims to strengthen its long-term conservation and help pass on the historical, artistic and cultural values that make it one of Portugal’s most remarkable heritage sites to future generations.