Premise: The Mus??e de Dieppe, also known as the Ceteau-Mus??e, in the 15th-century chateau in the Rue de Chastes, has a good collection of model ships and carvings in ivory, dating from the 18th century when elephant tusks were a major import from Africa and Asia.

Hypothesis: The chateu in the Rue de Chastes was built in the 12th century.
Relation: contradiction