Frieda Reiss (フリーダ・レイス Furīda Reisu?) was Rod Reiss's eldest daughter and Historia's oldest half-sister. She was the true queen of the Walls from 842 to 845 and the last of the Founding Titans before it was merged with the Attack Titan. She is known to appear in Eren and Historia's obtained memories. Frieda tended to be a good and caring person. She liked to walk and look after the peasants. She loved Historia to the point that she erased her memories.