What is "qlisura"

Qlisura (or Qalisura, Callisura, from kleisoura) was a diocese in the Jacobite metropolitan province of Melitene ( Malatya), attested between the ninth and thirteenth centuries. Eighteen Jacobite bishops of Qlisura are mentioned in the histories of Michael the Syrian and Bar Hebraeus, and in other West Syrian sources. By 1283, as a result of several decades of warfare and brigandage, the diocese of Qlisura was ruined, though it apparently still had a bishop several years later. The diocese is not again mentioned, and seems to have lapsed around the end of the thirteenth century.