The Marquis de Lasteyrie | |
|---|---|
 Photograph of Constance and the Count de Lasteyrie, 1912 | |
| Born | Guy Louis Jules de Lasteyrie du Saillant 3 October 1879 |
| Died | 14 August 1944 (aged 64) |
| Spouse | |
Guy Louis Jules de Lasteyrie du Saillant, 5th Marquis de Lasteyrie du Saillant (3 October 1879 – 14 August 1944), of Ponthieu, was a member of the Lasteyrie du Saillant noble family of France.