Namesakes
Characters in Greek Mythology:
3 characters
Diomedes (m) 
Diomedes (m)
Diomedes (m)
Characters in Roman Mythology:
1 character
Diomedes (m)
Saints:
1 saint
Saint Diomedes ?-304
Shakespearian Characters:
2 characters
Diomedes Antony and Cleopatra
Diomedes Troilus and Cressida