Tags: Noble.
John III of Rietberg (1566 Aurich – 23 January 1625 Rietberg) was a member of the Cirksena family. He founded the Catholic side line of the Cirksena in the Westphalian County of Rietberg the so-called house of East Frisia.He was a son of Count Edzard II of East Frisia and Princess Katarina of Sweden and ayounger brother of Count Enno III of East Frisia.John married in 1601 with Sabina Catherine the daughter of his brother Enno III.