What is manderley castle owner?

Manderley Castle is a fictional estate featured in Daphne du Maurier's novel "Rebecca." Therefore, it does not have a real owner in real life. In the novel, Manderley Castle is the home of Maxim de Winter and his first wife, Rebecca. After Rebecca's death, Maxim marries the novel's protagonist, who is never named and only referred to as the second Mrs. de Winter. No background information is provided about Maxim's profession or wealth, other than that he inherited Manderley from his family.