As we look up into the vault of the apse, we may see, in the centre, the Christogram surrounded by rays of golden light. It is flanked by angels holding the nails of the Cross (left) and the Inscription plate (right).
The lower walls of the apse display panels with frescoes. One of these frescoes (severely decayed) has a putto holding the Veronica, i.e. the veil of Veronica with the true image of Jesus Christ. It is enclosed by a golden flower-festoon. As Jesus Christ was struggling His way to Golgotha, a pious woman named Veronica came up to Him and wiped His face with a piece of cloth. The image of the Saviour's face then appeared on the cloth.