A pillar-saint, probably Simeon Stylites the Elder.

A stylite (from Greek στυλίτης, stylitēs, "pillar dweller", derived from στῦλος, stylos, "pillar") or pillar-saint is a type of Christian ascetic in the early days of the Byzantine Empire who lived on pillars, preaching, fasting and praying. Stylites believed that the mortification of their bodies would help ensure the salvation of their souls. The first stylite was probably Simeon Stylites the Elder who climbed on a pillar in Nothern Syria in 423 and remained there until his death 37 years later.

The frescos in the northeast aisle arcade of the church date from the 12th century.

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