A devout Christian woman who becomes the romantic interest of Prefect Marcus Superbus. She steadfastly refuses to abandon her faith despite intense pressure from Marcus and the Roman authorities. Ultimately sentenced to execution in the arena, her unwavering conviction leads Marcus to join her in death.
Poppaea treats Mercia as a romantic and political rival.
Poppaea is jealous of Mercia, influences the emperor to sign Mercia's arrest order, and orders Mercia to be executed alone.
They belong to the same persecuted Christian community.
Mercia is apprehended with Titus as a Christian, and both are present at the secret Christian gathering near the Cestian Bridge.
They are connected through the same Christian congregation and its clandestine gathering.
Stephan informs the Christian community about the secret meeting where Mercia is present.
Licinius enforces the order that sends Mercia toward execution.
Licinius arrives at Marcus's home to arrest Mercia after she refuses to renounce her faith.
Their only shown connection is a formal introduction at the feast.
At the feast in Marcus's home, Mercia is introduced to Ancaria, who performs an exotic dance.
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