Template:Wp-Oppenheim-History

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In 765, the first documented mention of the Frankish village was recorded in the Lorsch Codex, in connection with an endowment by Charlemagne to the Lorsch Abbey. Further portions of Oppenheim were added to the endowment in 774. In 1008, Oppenheim was granted market rights. In October 1076 Oppenheim gained special importance in the Investiture Controversy. At the princely session of Trebur and Oppenheim, the princes called on King Henry IV to undertake the "Walk to Canossa". After Oppenheim was returned to the Empire in 1147, it became a Free Imperial City in 1225, during the Staufer Emperor Frederick II's. At this time, the town was important for its imperial castle and the Burgmannen who lived there.

In the 14th century, the town was pledged to the Electorate of Mainz and beginning in 1398, it belonged to the territory of the Electoral Palatinate.

In 1621, the Oppenheim town chronicle reports a great fire in which the Oppenheim Town Hall was almost completely destroyed. The Electoral Oberamt archive, too, was lost in the fire, and so it was moved to Mainz. [the meaning here is not clear]

On 14 September 1620, Spanish troops overran the town in the Thirty Years' War. The Spaniards occupied Oppenheim until 1632. In 1688, French troops overran the town in the Nine Years' War (1688–1697). On 31 May 1689, Landskrone Castle and the town were utterly destroyed by the French under General Mélac. Until 1797, Oppenheim remained an Electoral Palatinate holding. After being in French hands, Oppenheim passed, in 1816, to the Grand Duchy of Hesse-Darmstadt. It remained Hessian until 1945.

In March 1945, troops of the 3rd Army under General George S. Patton managed to build a crossing over the Rhine near Oppenheim and to occupy it.