 A treasure of the Cathedral is the ancient Saint Thomas Cross of Saint Thomas Christians excavated in 1935 near the site of the ancient city of Sirkap, although its antiquity is disputed .The structure is also well known for its stained glass windows, pipe organ, and a clock that dates back to 1862.According to historians, the first church of Lahore was constructed in 1595 near the Lahore Fort, during the Portuguese period when Jesuit missionaries were attending the court of the Mughal Empire.