It was built by Colonel Erhard Reichsfreiherr von Ehrentreuter of Hofrieth (1596-1664), commander of the Dutch garrison in Emden, between the years 1642 and 1650. He named the castle after his wife Eva, Baroness Ungnad, of Bohemia, whom he had married in 1631. Colonel von Ehrentreuter had been enfeoffed with Loga and the neighbouring village of Logabirum by Count Ulrich II of East Frisia to pay off his considerable gambling debts. Descendants of the von Wedel family, whose main residence today is Gödens Castle in the parish of Sande, occupied the Evenburg for centuries.