Question:
Who was the owner of château d'Anet in Sep, 1840?

Context:
 château d'Anet is owned by Ferdinand Moreau from Jan, 1860 to Jan, 1884. 
 château d'Anet is owned by Adolphe de Riquet de Caraman from Jan, 1840 to Jan, 1860. 
 château d'Anet is owned by Diane de Poitiers from Jan, 1531 to Jan, 1566.

Answer:
Adolphe de Riquet de Caraman