Both Uses

martyr
in
Main Street, by Sinclair Lewis
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"Well——" Self-pity because he did not divine that this was a surprise party rendered her sad and interesting to herself, and she had the pleasure of the martyrs in saying bravely to him, "It's nothing special.†
Chpt 15

martyrs = dies or suffers due to upholding principle; or people who have suffered such a fate
She admitted to her fellow-teachers that the schoolbuilding was slightly damp, but she insisted that the rooms were "arranged so conveniently—and then that bust of President McKinley at the head of the stairs, it's a lovely art-work, and isn't it an inspiration to have the brave, honest, martyr president to think about!"†
Chpt 21 *

martyr = someone who dies or suffers to uphold principles

Definitions:

(1) (martyr)
someone who is killed or made to suffer greatly for their beliefs, often unjustly; or someone who acts as if they suffer a lot; or to make someone into such a person
(2) (meaning too rare to warrant focus)