The so-called Temple of Diana was part of the Roman sacred complex but it was not a temple, rather it was a library that originally faced onto a portico that enclosed much of the spring sanctuary. The date is uncertain; some scholars suggest the first century, others the second. It was used as a church from the Middle Ages till the 16th century when it was damaged in the Wars of Religion.
References:The Château du Lude is one of the many great châteaux of the Loire Valley in France. Le Lude is the most northerly château of the Loire Valley and one of the last important historic castles in France, still inhabited by the same family for the last 260 years. The château is testimony to four centuries of French architecture, as a stronghold transformed into an elegant house during the Renaissance and the 18th century. The monument is located in the valley of Le Loir. Its gardens have evolved throughout the centuries.