Wilhelm Wiegand is best known for and his publications involving a man that was King of Prussia beginning in what year?
Wilhelm Wiegand:  He is best known for his research of Alsatian history and his publications involving Frederick the Great. Frederick the Great: Frederick II (German: "Friedrich" ; 24 January 171217 August 1786) was King of Prussia from 1740 until 1786, the longest reign of any Hohenzollern king.
1740