Namesakes

Roman and Byzantine Emperors: 1 emperor
Emperor Gaius Vibius Trebonianus Gallus (a.k.a. Gallus)   251-253  
Saints: 1 saint
Saint Gall (a.k.a. Gallus)   c. 550-645  
Shakespearian Characters: 1 character
Gallus   Antony and Cleopatra