The map of Father Dac Lo in 1651 records Tran Bien Palace as Dinh Phoan, in front of the Palace there is a river. Nowadays, Tran Bien Palace is known locally as Old Citadel in Hoi Phu village, An Ninh Tay commune, Tuy An district, Phu Yen province. Tran Bien Palace has now sunk deep under the Cai River. Quan Tran Thu's wife is Princess Ngoc Lien - the eldest daughter of Lord Sai received baptism in 1636 with the holy name of Mary Magdalene. After that, she set up a chapel in Tran Bien Palace, and evangelized everyone