Martha—or Saint Martha, the Dragon Rider—was a 1st-century saint famous for dealing with the Tarasque, a fearsome dragon she managed to suppress. The wild part? She apparently made this grotesque monster fall completely in love with her. Fans often note the contrast between her holy nature and the sheer absurdity of the situation.
In the Fate series, she gets summoned by Gilles de Rais as a Berserker-Rider-class Servant to fight against Mash Kyrielight and Ritsuka Fujimaru, showing up among several other Servants brought into the conflict.
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