Eulalios

Eulalios was a famous Byzantine painter who lived during the 12th century, a time in which most art was done anonymously. His name was noted by several writers of the time who also described his paintings, such as Nicephorus Callistus and Nicholas Mesarites. Of his works, the most famed was the dome of the nowdemolished Church of the Holy Apostles in Constantinople. The painting is a depiction of Christ Pantocrator.

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Source: Wikipedia