martyr
Definitions
A person who is killed because of their religious or other beliefs.
A person who displays or exaggerates their suffering to obtain sympathy or admiration.
A person who sacrifices something of great value for the sake of a principle or cause.
Examples
She felt like a martyr after spending the entire weekend cleaning the house while everyone else relaxed.
The historical figure is remembered as a martyr who sacrificed his life for the cause of freedom.