Grand Mosque of Buton Palace (Al-Muqarrabin Grand Mosque)

Grand Mosque of Buton Palace: Architectural Grandeur of Islam in the Heart of the World's Largest Fortress

Masjid Agung Keraton Buton, officially known as Masjid Agung Al-Muqarrabin, is more than just a place of worship for the people of Bau-Bau, Southeast Sulawesi. This building is a historical monument that represents the meeting point of Islamic theology, the social structure of the Buton Sultanate, and local architectural wisdom. Standing majestically within the complex of the Buton Palace Fortress—recognized as the world's largest fortress by the Guinness Book of World Records—this mosque is a symbol of the glory of maritime civilization in Eastern Nusantara.

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History and Background of Construction

The mosque was first built during the reign of the 19th Sultan of Buton, Sultan Sakiyuddin Durul Alam, in 1712. However, the historical roots of Islam's spread in Buton extend far beyond that. The construction of this mosque was an effort to consolidate the identity of the sultanate, which had adopted Islam since the 16th century.

Unlike modern mosques that employ international architectural firms, Masjid Agung Al-Muqarrabin was designed and built by royal builders (Pande) who understood the philosophy of Sara Pataanguna (the four pillars of Buton's life principles). Its construction involved all elements of society as a form of devotion to God and the Sultan, creating a building with a strong emotional connection to its inhabitants.

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Design Philosophy and Structural Layout

The architecture of Masjid Agung Keraton Buton embraces the Nusantara vernacular style with strong influences from Buton traditions. One of the most striking features is the absence of the metal dome commonly found in modern mosques. Instead, this mosque uses a tiered or multi-level roof made from natural materials in the past, symbolizing the spiritual levels in Islam: Sharia, Tariqa, Haqiqah, and Marifat.

Structurally, the building is a robust square. The numbers used in its construction were not chosen randomly but carry symbolic meaning:

1. Support Pillars: There are 12 main pillars, symbolizing the number of leaders or officials in the governmental structure of the Buton Sultanate known as Siolimbona.

2. Doors and Windows: The mosque has 12 entrance doors, philosophically referring to the 12 openings in the human body, reminding worshippers to guard their senses and purity when entering the house of God.

3. Staircase: The number of steps leading to the main entrance is also adjusted according to calculations from the Islamic calendar and the sultanate's lineage.

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Unique Architectural Components and Materials

One of the most legendary unique features of Masjid Agung Keraton Buton is the use of unconventional materials for its time. Based on oral traditions and local history, the cement mixture used to bind the stones in the mosque's foundation and walls consisted of egg whites, lime, and sand. This method proved highly effective; the building remains standing strong despite enduring various earthquake shocks and extreme weather for over three centuries.

Another unique element is the presence of a Giant Drum known as Mangu-mangu. This drum is approximately 3 meters long and made from a single piece of teak wood. Its sound was once used to mark prayer times and as a communication tool to gather the people within the fortress during emergencies.

In the interior, the mihrab (the niche where the imam stands) is designed very simply yet elegantly with fine wooden calligraphy carvings. The mosque's ceiling displays interlocking wooden structures with minimal use of iron nails, showcasing the skilled woodworking craftsmanship of the past Buton people.

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Symbolism of "Center of the Earth" and Secret Hole

Local people believe that within Masjid Agung Keraton Buton, there is a hole called Popana or the "Center of the Earth." Architecturally, it is a small hole in the mosque's floor that is said to be connected to an underground cave beneath the fortress.

Symbolically, the existence of this hole positions the mosque as a spiritual axis (axis mundi) for the Buton Kingdom. There is a legend that from this hole, one could hear the adhan (call to prayer) from Mecca, a folktale that reinforces the mosque's status as a very sacred place with a metaphysical connection to the holy land.

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Social Function and Life within the Fortress

Masjid Agung Al-Muqarrabin is not just a place of prostration but also a center of social gravity. In the mosque's courtyard, major traditional ceremonies such as Ma'atanoana (coming-of-age ceremony) and the Sultan's inauguration are held. The mosque's layout, being close to the Kamali (Sultan's Palace) and a large field, indicates that in the ancient Buton urban planning, religion and state were two sides of the same coin.

To this day, the mosque still functions fully for daily worship. Uniquely, the tradition of delivering sermons in this mosque still maintains the full use of Arabic to preserve the originality of the tradition, while explanations in the local or Indonesian language are provided outside the formal sermon sessions on specific occasions.

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Visitor Experience and Preservation

Visiting Masjid Agung Keraton Buton offers an extraordinary sensory experience. Due to its location on a hilltop within the fortress, visitors are greeted by a gentle sea breeze and stunning views of the Buton Strait from above. The atmosphere inside the mosque feels very cool even without air conditioning, thanks to the natural ventilation system from the large windows and the high tiered roof.

The Bau-Bau City Government and the Cultural Heritage Preservation Center continuously strive to maintain the authenticity of this structure. Although it has undergone several renovations to the roof and floor, the main wooden structure and stone foundation remain preserved as originally built.

As an architectural icon, Masjid Agung Keraton Buton is tangible proof that a building's beauty lies not only in its visual splendor but in the depth of philosophy embedded in every joint of its structure. It is the personification of the Buton people's spirit: strong like a fortress, yet always prostrating in deep spiritual submission. For architects and historians, this mosque is a living laboratory on how Islam adapted to local culture without losing its divine essence.