The Orthodox Cathedral of Chania or church of Trimartiri is situated in Halidon street little before the old Venetian harbour of Chania.
The present temple was built on the place of an older church of Virgin Mary which dated back to the 14th century.
In 1645, during the Ottoman occupation, the temple was converted into a soap factory , owned by the Turkish official Moustafa Pasha Giritli.
The construction of the church was completed in 1860 in the style of a three aisle Basilica.
On the northeast side of the temple there is the high bell-tower.
The church features three aisles with the central one dedicated to the Virgin Mary (celebrated on November 21st), the north aisle one dedicated to Saint Nicholas and the southern one to the Three Hierarchs.