Namesakes
Persian and Iranian Kings and Queens:
4 kings
King Seleucus I Nicator 306-281 BC 
King Seleucus II Callinicus 246-225 BC
King Seleucus III Ceraunus 225-223 BC
King Seleucus IV Philopator 187-175 BC
Saints:
1 saint
Saint Seleucus of Syria ?
Seleucid Kings and Queens:
6 kings
King Seleucus I Nicator 306-281 BC
King Seleucus II Callinicus 246-225 BC
King Seleucus III Ceraunus 225-223 BC
King Seleucus IV Philopator 187-175 BC
King Seleucus V Philometor 126-125 BC
King Seleucus VI Epiphanes 96-95 BC
Shakespearian Characters:
1 character
Seleucus Antony and Cleopatra