He was the son of the chieftain Edzard II of Appingen-Greetsiel and his wife Doda tom Brok.
Enno was a pioneer of the claim of the house Cirksena to the rule over all of East Frisia, which his son finally Ulrich I formally achieved when he was made an Imperial Count in 1464.
He married his second wife Gela Syardsna of Manslagt (d. 1455), a daughter of the chieftain Affo Beninga of Pilsum.
His son Edzard from his first marriage, married Frauwa Cirksena and Enno and Edzard adopted the Cirksena family name and coat of arms, to emphasize the succession.
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