Joanna of Swabia
Joanna of Swabia (c. 1280–1352) was the daughter of Conrad of Antiochia, grandson of Emperor Frederick II, by Beatrice Lancia. While travelling to Germany to marry a nobleman she had never met, she stopped at Verona as guest of her sister Constance, wife of Bartolomeo I della Scala.
Cangrande I della Scala fell in love with her and married her in 1308. The marriage was childless, though Cangrande left several illegitimate children. She died in 1352.