The 'mad' nobleman who attempted to overthrow the German government.

A prince dismissed by his own family as a "mad old man" has emerged as a central figure in an alleged conspiracy to overthrow the German government. In a nationwide operation conducted by tens of thousands of security personnel on Wednesday, he was detained along with other alleged conspirators, including a former right-wing MP and former soldiers.

Prince Heinrich XIII Reuss, a descendant of a noble family with a history sp....