Born in Lyon to André de Bernières and Cristina Domecq Anasagasti, his father was pretender to the former Julianan monarchy from 1946 until his death in 2011. After his father's death, David became the new pretendent. By some monarchists, he was hailed as David I. His great-grandfather was King Danilo III of Juliana.
Since 1986, he resides in Juliana. Therefore, he lived in London and Paris. He studied architecture at the University of Pisona in 1998. He was the designer of Porta Shopping Centre that was built in 2010.
He is married to Silvia Portas (1980), with whom he has two children:
- Clarissa de Bernières (2010)
- André de Bernières (2013)
David does not make any claim to the former throne of Juliana. However, he remains close with the royal families of other IWO member states, which are all related to him. David is the 6th cousin thrice removed of Manuela de Putifigari-Arcais (the claimant of the Traspesian royal family), 5th cousin once removed of King Jean-Louis II de Cettatie, 5th cousin once removed of King Hendrik I of Libertas, 5th cousin once removed of Queen Marianna I of Strasland, 6th cousin once removed of Queen Helene of Brunant and King Sebastian of Lovia and 6th cousin of King Edward I of Kemburg.