The Eski Cami — Old Mosque — is the oldest Ottoman mosque in Edirne, completed in 1414 during the reign of Mehmed I. Where the Selimiye dazzles with ambition, the Eski Cami impresses with its solidity and directness. The building follows an early Ottoman multi-domed scheme: nine equal bays covered by nine equal domes, arranged in a three-by-three grid. The exterior is austere, built from alternating courses of stone and brick in the Byzantine manner the Ottomans inherited. Two minarets flank the entrance portal.
Inside, the defining feature is the enormous calligraphy. The names of Allah and the Prophet Muhammad are rendered in huge black script on the white walls — bold to the point of being abstract, filling entire wall panels with single words. The effect is striking and intentional: this is one of the earliest and finest examples of the tradition. The mosque sits in the commercial heart of the old city, surrounded by market stalls and the noise of daily life, and it functions as an active neighbourhood mosque as it has for six centuries.