Report on the examination and treatment of a 15th century altarpiece by Carlo Crivelli Madonna della Rondine . After the examination of the principal panel of the predella and of the frames by means of X-ray radiography the following treatment was carried out: cleaning of the old varnish of the dust and of the retouching of the main panel which revealed a painting in very good condition, consolidation of the panel; for the predella, a 19th century gilding was removed and under these accretions the remains of the original gold was exposed, the paintings were cleaning appearing also in good condition, and the crack in the wood was relaxed, realigned and consolidated. The restoration was carried out in Paraloid B72, Ketone-N was used as a varnish. In appendix notes on the carving on the pilasters of the frame, and a summary of some aspects of the materials and technique of the central panel and predella frames.