This is a disambiguation page.
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Constantine is a name with several possible holders, many of whom were royalty or leaders.
Doctor Who universe
Only one name
- Constantine I, Roman Emperor
- Constantine (The Parliament of Rats) (PROSE: The Parliament of Rats)
- Constantine (The Shadows of Avalon) (PROSE: The Shadows of Avalon)
- Constantine (The Empty Child), a medical doctor seen in The Empty Child and The Doctor Dances
- Constantine (Zeta Major), Arch-Cardinal and head of the Morestran Church on Alpha Major, featured in PROSE: Zeta Major