Artist Barry Thompson and I are both fans of this National Gallery painting of Saint Veronica from 1420. Legend relates that when Christ fell as he was carrying the cross Saint Veronica wiped his face with her handkerchief (sudarium). The image of Christ's face was then miraculously imprinted on it.
The saint's name is inscribed on her halo in Latin (Sancta Veronica); Christ's halo has an abbreviated Greek form of his name (ihs.xp.ih.x). Barry and I are currently working on a drawing based on the painting. I'm drawing Jesus and Barry is doing all the tricky bits.