Shaykh Bahai is traditionally credited with designing Isfahan’s Sheikh Lotfollah Mosque.
The mosque was built during the reign of Safavid ruler Shah Abbas I, with construction beginning in 1603 and the building completed in 1619. It stands on Isfahan’s Naqsh-e Jahan Square, opposite the Ali Qapu palace.
Unlike a large congregational mosque, Sheikh Lotfollah Mosque was a royal prayer building and has no minaret or public courtyard. Its inward-focused design leads worshippers through a passage that turns toward the direction of Mecca, allowing the building to align with the square while still facing the qibla.
The dome’s cream-colored exterior and richly patterned interior tilework are among its defining features. Attribution to Shaykh Bahai is traditional; some architectural details are also discussed in connection with the court architect Ali Akbar Isfahani.