The family's earliest known ancestor is Otto "cum
plata", who was first mentioned in 1252 as
Vogt of
Jaromar II, Prince of Rügen. The line of Platen-Hallermund (officially a Platen family, but represented a bastard line of the
Guelphs), which was raised to the rank of
Imperial count in 1689 by
Leopold I, Holy Roman Emperor, acquired the
County of Hallermund in 1704 and therefore belonged to the high nobility since 1709. As a consequence of the
Napoleonic Wars the family was
mediatized by
Westphalia in 1807 and was later ceded to
Hanover in 1813. The male line of the Counts of Platen-Hallermund exist until today and live in
Germany. ==Swedish branch==