Orhan Mosque İzmit – Gazi Süleyman Paşa Mosque & Visitor Guide

The Ottoman Conquest of Nicomedia in 1332

For centuries before the Ottomans, İzmit was known as Nicomedia, one of the most important cities of northwestern Anatolia. Its strategic position at the end of the Gulf made it a natural gateway between Constantinople, Bithynia and the interior.

During the expansion of the early Ottoman principality under Orhan Gazi, the remaining Byzantine strongholds of Bithynia gradually came under increasing pressure. Nicomedia passed into Ottoman rule in 1332, bringing another major urban centre into the young state.

Local tradition connects Gazi Süleyman Paşa, Orhan Gazi's eldest son, with the completion of the conquest and with the establishment of the mosque that now carries his father's name.

This is why Orhan Mosque should be read as more than a religious building. It stands as an architectural marker of a political transformation: Byzantine Nicomedia becoming Ottoman İzmit.

When Was Orhan Mosque Built?

Orhan Mosque is traditionally dated to 1332, immediately following the Ottoman takeover of Nicomedia. The site is therefore associated with the very beginning of Ottoman İzmit.

The mosque's original construction inscription has not survived, which means the building cannot be dated today from an intact fourteenth-century foundation text. Instead, its early history is reconstructed from later records, foundation traditions and inscriptions associated with subsequent repairs.

A later plaque inside the mosque refers to Gazi Süleyman Paşa, the conquest of İzmit, Hereke, Aydos and Kocaeli, and to the mosque and medrese. Because this plaque is not the original construction inscription, it should be treated as evidence of historical memory rather than as an untouched fourteenth-century document.

The Sword Khutbah Tradition at Orhan Mosque

During the Friday sermon at Orhan Mosque, the imam traditionally ascends the minbar carrying a sword. The act is understood locally as a symbol of conquest and of the mosque's identity as İzmit's fetih camii.

The practice reflects a wider Ottoman ceremonial idea in which a sword could accompany the khutbah in mosques connected with conquest. The sword was not simply a weapon in this context; it functioned as a visual sign of sovereignty, authority and historical memory.

There is, however, an important historical nuance. Modern local accounts do not agree that the present practice has continued without interruption since 1332. Some institutional descriptions present it as the survival of an old Ottoman custom, while Kocaeli municipal historical material suggests that the modern continuous form of the practice may have been revived much later.

For visitors, the safest historical interpretation is therefore: the sword khutbah is a genuine and living tradition associated with the mosque's conquest identity, but claims of an unbroken seven-century ceremonial continuity should be treated cautiously.

The 1843 Restoration under Sultan Abdülmecid

One of the most important dates in the architectural history of Orhan Mosque is 1843. During the reign of Sultan Abdülmecid, the mosque underwent a substantial restoration.

This intervention was much more than routine maintenance. By the nineteenth century, the medieval building had already passed through centuries of earthquakes, weather and repairs. The Abdülmecid-period work altered several architectural elements and helped give the mosque much of the character visible today.

A restoration inscription from the Abdülmecid period is associated with this nineteenth-century campaign. The survival of such evidence is important because the original fourteenth-century construction inscription is lost.

The Minaret of Orhan Mosque

The minaret visible today should not be mistaken for an untouched fourteenth-century tower. The original appearance of the mosque's earliest minaret is not securely known.

Historical accounts indicate that the minaret was renewed during the nineteenth century. It later suffered damage from a lightning strike in 1945 and was again affected by the 1999 Marmara earthquake.

During restoration work in 2007, the minaret was reconstructed with the aim of reflecting nineteenth-century characteristics. Its present form therefore belongs to the long restoration history of the mosque.

Was There a Medrese at Orhan Mosque?

Historical references connected with Orhan Mosque mention a medrese associated with the foundation. The surviving mosque therefore belonged to a broader religious and educational environment than the modern visitor might assume.

The medrese itself has not survived as a complete historic building, but its memory remains important. Graves in the hazire include people identified with the educational life of the former institution, helping preserve the link between worship and learning.

This is another reason not to interpret Orhan Mosque as an isolated structure. The site once formed part of a more complex institutional landscape in the upper Ottoman city.

Earthquakes, Repairs and the Survival of Orhan Mosque

İzmit lies in one of Türkiye's most active earthquake regions, so no building with a history approaching seven centuries could survive unchanged. Orhan Mosque has repeatedly been repaired and strengthened.

The most important visible historical transformation took place during the 1843 restoration under Sultan Abdülmecid. Later interventions addressed damage, weathering and the structural condition of the building.

The 17 August 1999 Marmara earthquake again caused serious damage. Restoration and conservation campaigns followed, including work on the minaret and later comprehensive treatment of the mosque.

The building was restored again and reopened after work completed in 2017. Conservation also included attention to the historic gravestones and the old plane tree in the mosque grounds.

Photography at Orhan Mosque

The most attractive photographs usually combine the mosque, minaret and old plane tree rather than isolating the building from its garden. The hillside setting also gives useful depth to exterior compositions.

Look for viewpoints that include the Gulf of İzmit or the urban landscape below. These wider images explain the strategic position of the mosque much better than close architectural details alone.

Inside, photography should remain secondary to worship. Do not use flash during prayer, avoid photographing worshippers closely and keep equipment quiet.

Visiting Orhan Mosque with Children

Orhan Mosque can be a good family stop because the visit does not need to be long and the story is easy to understand: an old hilltop mosque, the conquest of Nicomedia, a symbolic sword tradition, historic graves and a very old plane tree.

Before entering, explain that the mosque is still used for prayer. Children should keep voices low, remove shoes and avoid running in the prayer hall or cemetery.

Combine the mosque with İzmit Clock Tower and SEKA Paper Museum for a varied day mixing history, views and more interactive museum experiences.

Practical Tips for Visiting Orhan Mosque

How to Get to Orhan Mosque

Orhan Mosque is in Orhan Mahallesi in the upper historic part of İzmit, approximately 2 kilometres from the central lower-city area.

The mosque can be reached on foot, but the climb is substantial compared with the flatter waterfront. Walking is best for travellers already exploring Kapanca Street, the Clock Tower and the historic hillside neighbourhoods.

Local buses and taxis can reduce the uphill walk. If using a taxi, ask for “Orhan Camii” or “Gazi Süleyman Paşa Camii, Orhan Mahallesi.”

Suggested Orhan Mosque & Historic İzmit Route

Begin at Kocaeli Archaeology Museum to understand ancient and Roman Nicomedia before the Ottoman conquest.

Continue uphill to Orhan Mosque. Explore the prayer hall, old plane tree, hazire and the views across the city. This is the point where the itinerary moves from Byzantine Nicomedia into early Ottoman İzmit.

From the mosque, continue through the upper historic neighbourhood toward Kapanca Street and the İzmit History Corridor, where timber houses, old fountains and steep lanes preserve the character of the traditional city.

Then descend toward İzmit Clock Tower and Kasr-ı Hümayun to explore the nineteenth-century Ottoman city.

Finish in the lower centre with Pertev Mehmet Pasha Mosque, where the story jumps forward from the early Ottoman frontier age to Mimar Sinan's sixteenth-century classical architecture.

Places to Visit Near Orhan Mosque

Orhan Mosque belongs naturally in a wider exploration of old İzmit, where ancient Nicomedia, early Ottoman history, nineteenth-century imperial architecture and modern industrial heritage survive remarkably close together.

Use our complete Kocaeli travel guide to continue across the wider province.