The definite partitioning of Saxony into
Saxe-Lauenburg, jointly ruled by Eric I and his brothers and
Saxe-Wittenberg, ruled by their uncle Albert II, took place before 20 September 1296, when the
Vierlande, Sadelbande (Land of
Lauenburg), the Land of
Ratzeburg, the Land of Darzing (later
Amt Neuhaus), and the
Land of Hadeln are mentioned as the separate territory of the brothers. However, his other brother then claimed a part for him, so in 1321 Eric passed Bergedorf (Vierlande) on to John II, whose share thus became known since as Saxe-Bergedorf-Mölln and Eric's as Saxe-Ratzeburg-Lauenburg. In 1338, Eric I resigned in favour of his son
Eric II. In the course of a feud between Eric II and the neighbouring Duke William of
Brunswick and Lunenburg (Celle) the latter's troops expelled Eric I from his castle Riepenburg in
Kirchwerder (today's
Borough of Bergedorf, Hamburg) and he perished in exile at his granddaughter Jutta in
Hoya's capital
Nienburg upon Weser. ==Marriage and issue==