Joan was the daughter of unknown parents. The date and place of her birth have not been found.
She had four marriages/partners. Her first husband was sir Walter Devereux. They were married, but the date and place have not been found. They had no known children.
Her second husband was Thomas Vaughan. They were married, but the date and place have not been found. They had no known children.
Her third husband was sir Edward Blount. They were married, but the date and place have not been found. They had no known children.
Her fourth husband was Thomas Poyntz. They were married, but the date and place have not been found. They had no known children.