Mercedes von Martritz is a fictional character from the novel "The Count of Monte Cristo," written by Alexandre Dumas. She is portrayed as a beautiful and devoted woman, initially engaged to Edmond Dantès, the story's protagonist. Her character embodies themes of love, loyalty, and sacrifice throughout the narrative. In the story, after Dantès is wrongfully imprisoned, Mercedes eventually marries Fernand Mondego, who has long harbored feelings for her. This marriage creates a complex love triangle that drives much of the plot, highlighting the emotional struggles and moral dilemmas faced by the characters involved.