I'm pretty sure we've got a connection which would make us cousins. My dad has mentioned Marcellus in the past. My dad is Roman Rau. He is still living. His father was Lambert Ludwig Rau. Lambert had a brother, Frank Ludwig Rau who was married to Elizabeth Anna Reber on 10-24-1904. Lambert and Frank's parents were "John" Joannis Michael Rau and Elizabeth Sophia Hagemann. I have more information if you are interested.
Hope to hear from you soon-
Rhonda (Rau) Metcalf