Joanna, Princess of Portugal

Joanna of Portugal OP (6 February 1452 – 12 May 1490) was a Portuguese regent princess of the House of Aviz, daughter of King Afonso V of Portugal and his first wife, Queen Isabel of Coimbra. She served as regent during the absence of her father in 1471. In 1475 she became a cloistered nun of the Dominican Order. She is venerated in the Catholic Church with the title 'Blessed', is commemorated by a feast on May 12, and is commonly known in Portugal as Holy Princess Joan (Portuguese: Santa Joana Princesa).