The well-preserved Roman sarcophagi, which were unearthed in the Hisardere / Bayirdibi region, approximately 1,5 km northeast of Iznik, which is the largest necropolis area of the ancient city of Nikaia, provide information not only about the local sarcophagi production of the region, but also adds new typological and iconographic information to the subject of Roman sarcophagi of Asia Minor. This article focuses on a new discovered columned sarcophagus made in Dokimeion, which was unearthed during the rescue excavations under the direction of Iznik Museum. The sarcophagus offers with its depictions in high reliefs some compositions that are rarely seen on Dokimeion sarcophagi. It also provides an absolute reconstruction for an another fragment of a Dokimeion sarcophagus which was previously misinterpreted due to its conservation status. The sarcophagus is an unique example with its roof-shaped lid and it changes some accepted judgements about the lids covering the sarcophagi of this type.