Niccolo di Liberatore ("L'Alunno")
Altarpiece of the Coronation of the Virgin: Detail, St. Sebastian?

Like Sebastian, this saint is portrayed as a handsome youth, and arrows are Sebastian's attribute, but they are usually shown piercing his naked torso. An arrow is also St. Giles's attribute, but he is always shown in a monastic habit.

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Photographed at the Pinacoteca Vaticana by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.