Tyanna of the Tower

Queen Tyanna of the Tower was the third wife of King Maegor Targaryen.

Biography
Grand Maester Myros spoke against the marriage of Maegor and Tyanna, arguing that Maegor's marriage to his second wife had ruined King Aenys's reign. For this, Maegor beheaded Myros and officially declared war on the Faith.

When Queen Alys miscarried, Tyanna declared that she had been unfaithful, and wrote a list of potential fathers of the stillborn child. The king executed Alys and her father, Lord Lucas Harroway, the Hand of the King. He then marched on Harrenhal and slaughtered the entire Harroway family.

Tyanna was also unable to give Maegor an heir. Desperate, Maegor took three more wives, known as the Black Brides.

In the books
In The World of Ice & Fire and Fire & Blood, Tyanna was rumored to be the natural daughter of a Pentoshi magister. She was a tavern dancer and later a courtesan. She was the first whisperers (using the feminine title "mistress of whisperers"). In 48 AC, she was seized and taken to the dungeons to be tortured. As the Kingsguards Owen Bush and Maladon Moore prepared their tools, she confessed responsibility for the miscarriages of Alys Harroway and Jeyne Westerling, and vowed that the same would happen to Elinor Costayne. Maegor cut out her heart with Blackfyre and fed her to his dogs. Two moons later, Queen Elinor miscarried.