#Gerard of Oldenburg (killed in action 1367 while invading Rüstringen)
In 1922, she was rebuilt as a merchant ship at the Deutsche Werke shipyard in Rüstringen.
In the course of the battle an East Frisian peasant army under Focko Ukena and Sibet of Rüstringen defeated the Oldenburg troops called by Chieftain Ocko II tom Brok to assist him, the Archbishop of Bremen and the counts of Hoya, Diepholz and Tecklenburg, who had besieged Detern.
In its broadest definition Ost-Friesland can be used to embrace all the Frisian parts of the German state of Lower Saxony, i.e. those areas which represent the "East Section" of the Inter-Frisian Council (which include the former Rüstringen (Butjadingen etc.), Land Wursten and sometimes other areas).
The Jeverland was formed in the 15th century from the Barony of Jever, which itself descended from the Banter Viertel, part of Östringen and the Wangerland.