In 1186 monks from the Cistercian abbey of Loccum founded the monastery of Reynevelde near where the stream Heilsau meets the river Trave.

After a short period under Austrian rule as a result of the Second War of Schleswig, Holstein became a province of Prussia in 1866.

The coat of arms is divided in two, the top half shows on a red background in yellow an Abbots crosier with the opening to the right and two stems of wheat with ears pointing away from the centre diagonally.

The bottom half shows on a blue background a silver carp from the side swimming to the left.

When an old level crossing between Bad Oldesloe and Reinfeld with the Hamburg-Lübeck railway line was turned into an underpass an old cobblestone section underneath the newer road surface reappeared and was preserved as a path for the nearby woods.