Myrielle

Myrielle, often referred to as Lady Myrielle, was a merchant's daughter and a former lover of Gendry Baratheon, and served him as his Mistress of Whisperers, and briefly as Hand of the King, after he ascended the throne. Despite being originally from Lannisport, Myrielle spent almost her entire childhood in King's Landing, and spent most of her adolescence mingling with nobility and smallfolk alike. Around 302 AC, she fell in love with the then-blacksmith Gendry, starting a long-term relationship with him, although Gendry had broken off the relationship by 304 AC. She survived the Great War, and after Gendry ascended the the Throne as King Gendry I Baratheon, he named her as his Mistress of Whisperers. Despite accepting, Myrielle felt betrayed by Gendry's love for Arya Stark, and following the outbreak of the War of the Narrow Sea, she secretly began working with the Second Triarchy to sabotage Gendry's war effort. After turning Gendry against his brother Edric, she briefly replaced Davos Seaworth as Hand of the King and resumed her romantic relationship with Gendry, until her treason was outed by Edric. Myrielle and her co-conspirators were tried and found guilty in the Great Trial of 310 AC, and she was executed for her crimes.