What is the fine-grained topic of the following text: In the 1820s Charles Alain de Rohan restyled the baroque castle into an imposing Neo-Classical edifice; however the present château was created between 1847 and 1862 by Charles’ nephew Prince Camille de Rohan. Only return the topic.
Renovation of a château by Charles Alain de Rohan and Prince Camille de Rohan in the 19th century.