Iznik Hagia Sophia (Orhan Mosque): 7th Ecumenical Council Sanctuary & Guide

1. Essential Facts and Quick Visitor Summary

Iznik Hagia Sophia (Orhan Mosque) is an extraordinary world heritage sanctuary that hosted the historic Seventh Ecumenical Council (Second Council of Nicaea) in 787 AD, was converted into a mosque by Ottoman Sultan Orhan Gazi in 1331, and was masterfully restored by chief imperial architect Mimar Sinan in the 16th century. Located at the central intersection of the ancient Roman Cardo Maximus and Decumanus Maximus thoroughfares in Nicaea (modern İznik), this monument embodies 1,600 years of Roman, Byzantine, and Ottoman cultural synthesis.

Operating today both as an active house of prayer and as an open cultural monument welcoming international travelers, Iznik Hagia Sophia features original burial niches, the stepped semicircular episcopal bench (synthronon), geometric opus sectile floor mosaics, and elegant Ottoman pointed arches.

2. The Seventh Ecumenical Council (Second Council of Nicaea, 787 AD)

The foremost historical milestone of Iznik Hagia Sophia was hosting the Seventh Ecumenical Council in 787 AD. Convoked by Empress Irene and Patriarch Tarasios, this assembly gathered approximately 350 bishops to conclude the destructive period of Byzantine Iconoclasm. The council decreed that icons of Christ, the Virgin Mary, and saints should be venerated (proskynesis) rather than worshipped (latreia), a distinction that reunited Christian theology across both East and West.

As the last ecumenical council recognized jointly by both Catholic and Eastern Orthodox communions, Iznik Hagia Sophia holds premier global significance in Christian theology and world church history.

3. Ottoman Conquest and Conversion by Orhan Gazi (1331)

Upon capturing Nicaea in 1331, Sultan Orhan Gazi converted the grand basilica into the city's principal Friday mosque, known historically as Orhan Camii. A brick minaret was erected at the southwestern flank, the orientation was aligned towards Mecca, and adjacent charitable foundations—including an soup kitchen and college—were established.

Together with the nearby Süleyman Pasha Madrasa, İznik flourished as the intellectual capital of the young Ottoman state.

4. Architectural Interventions by Mimar Sinan

Following catastrophic fires and tremors in the early 16th century, Sultan Suleiman the Magnificent commissioned his chief architect, Mimar Sinan, to reconstruct and stabilize the monument. Rather than dismantling the Byzantine fabric, Sinan preserved the ancient exterior walls and columns while introducing classic Ottoman brick-and-stone pointed arches to support a restored timber roof.

Sinan also sculpted a magnificent carved marble mihrab niche into the southeastern wall, harmonizing ancient Christian basilical space with Islamic spiritual geometry.

5. Architecture: Synthronon, Opus Sectile Floor, and Frescoes

The structure presents a classic three-aisled basilica design:

• Synthronon: A tiered semicircular seating tier in the eastern apse where clergy sat during synods and the 7th Ecumenical Council.
• Opus Sectile Mosaics: Intricate geometric floor medallions made from cut colored marbles and porphyry.
• Frescoes & Burial Niches: Wall niches (arcosolia) in the narthex containing surviving Byzantine religious frescoes and tombs.
• Roman Spolia: Classical Corinthian marble capitals and columns repurposed from Roman Nicaea's imperial temples and theater.

6. Modern Restoration and Dual Function

Restored thoroughly between 2007 and 2011, the building reopened for Islamic worship in November 2011 while maintaining its museum-grade architectural preservation. Visitors of all faiths walk freely inside outside prayer times, observing both Byzantine iconography and Ottoman calligraphy under one roof.

7. How to Get There and Parking

İznik Hagia Sophia sits at the absolute center of town, equidistant from all four historical gates:

• From Bursa: Frequent regional minibuses depart from Bursa Intercity Terminal and East Terminal (approx. 1 hour 15 minutes).
• From Istanbul: Crossing the Osmangazi Bridge and taking the Yalova-Orhangazi route takes approximately 1.5 to 2 hours by car.
• Parking: Municipal street parking and lots are available within 50–150 meters of the central plaza.

8. Visitor Etiquette and Guidelines

• Dress Code: As an active mosque, shoes must be removed before entering carpeted sections. Modest dress covering shoulders and knees is required; complimentary headscarves are provided at the entrance for female visitors.
• Photography: Photography without flash or tripods is permitted. Avoid pointing cameras directly at worshipers during prayer.
• Preservation: Do not touch surviving wall paintings or step beyond protective glass railings over the opus sectile floor mosaics.

9. Nearby Attractions in İznik

• Süleyman Pasha Madrasa: 250 meters away, housing historic tile workshops.
• İznik Green Mosque (Yeşil Cami): Renowned for its stunning turquoise and green glazed brick minaret.
• Ancient City Walls and Lefke Gate: Monumental Roman triple-arch gate.
• Lake İznik Waterfront: Perfect for tasting local freshwater catfish and watching sunsets.

10. Local Delicacies and Authentic Tile Shopping

While visiting, acquire authentic handmade quartz tiles bearing 16th-century Ottoman patterns from licensed local kilns, and taste famed Lake İznik catfish (yayın balığı) and thin-skinned cured table olives.