Fresco with bishops in Ecumenical Council. Possibly an evocation of the First Council of Nicaea (325 AD), which St.Nicolas attended to. In that case, the emperor depicted (on the right of the cross, but not shown on this picture) is Constantine I (the Great).
The frescos must be dated around the 12th century, since this part of the church was built in the mid-11th century, and the city of Myra was completely deserted by the early 14th century.

Correspondent: J.M.Criel, Antwerpen.
Source: Website of ‘stnicholascenter.org’ .