It's possible you are misremembering the name. Could you double-check the spelling or provide any other details about the character you are thinking of?
Perhaps you are thinking of:
* Doctor Manette: The main character's father, who was unjustly imprisoned for 18 years.
* Doctor Alexandre Manette: The doctor who was falsely accused of treason and imprisoned for 18 years.
* Dr. Alexandre Manette: The main character's father, who was a physician before his unjust imprisonment.
Let me know if any of these sound familiar!