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He was probably son of a Claus Fleming who between 1331 and 1354 is mentioned as bailiff of Barth in the Pomeranian principality of Rügen (a Danish fief) and had in principle the same Coat of Arms.
The Duchy of Pomerania-Barth was created from the western possessions on the mainland of the former Principality of Rügen.
They split the duchy with Wartislaw X receiving the principality of Rügen (with Rügen, Barth, Tribsees and Grimmen) while Eric received the eastern parts.
After the death in 1325 of Wizlaw III, Prince of Rügen, the last Prince of Rügen, Wizla's nephew, Duke Wartislaw IV, was enfeoffed with the Principality of Rügen by the Danish king, in accordance with the contract of inheritace of 1321.