His mother Camilla (ru: Камилла Альбертовна Кавос, and then Бенуа) was the granddaughter of Catterino Cavos.
In the field of secular music Davydov participated in the composing of opera tetralogy Mermaid (together with Ferdinand Kauer and Catterino Cavos, 1803–1807, providing the additional music for the 1st, 3rd and 4th parts).