 The Church of Christ Pantocrator is usually dated to the late 13th or early 14th century . University of Pennsylvania scholar Robert G. <unk> places its construction in the mid @-@ 14th century . Rough <unk> author Jonathan <unk> attributes its building to the rule of Tsar Ivan Alexander of Bulgaria ( r . 1331 – <unk> ) , though during this time control of Nesebar changed many times between the Second Bulgarian Empire and <unk> . The church is dedicated to Christ Pantocrator , a name of God which <unk> him as the " Ruler of All " in Greek . 
