mar·a·thon·er 
(mărə-thŏn′ər)
(mărə-thŏn′ər)n.
One that participates in a marathon, especially a marathon runner.
mara·thon′ing n.
- Frederick Augustus Porter
- Frederick Austerlitz.
- Frederick Barbarossa
- Frederick Carlton
- Frederick Chapman
- (Frederick) Childe
- Frederick Grant
- Frederick I
- Frederick II
- Frederick II
- Frederick IX
- Frederick Jackson
- Frederick James
- Frederick Law
- (Frederick) Louis
- Frederick Moore
- Fredericksburg
- Frederick the Great.
- Frederick the Great
- Frederick William
- Frederick William I
- Frederick William II
- Frederick William III
- Frederick William IV
- Frederick Winslow