Joan was the daughter of unknown parents. The date and place of her birth have not been found.
She had two marriages/partners. Her first husband was Maurice FitzGibbon. They were married, but the date and place have not been found. Their only known child was Margaret (1602-1666).
Her second husband was Thomas FitzGerald. They were married, but the date and place have not been found. They had no known children.
Note 1
dau. of James Butler, 2nd Lord of Dunboyne d 18.02.1624