text: History Haguenau dates from the beginning of the 12th century, when Duke Frederick II the One-Eyed (1090 – 6 April 1147) of Swabia erected a hunting lodge on an island in the river Moder. The medieval King and Holy Roman Emperor Frederick I Barbarossa fortified the settlement and gave it town rights, important for further development, in 1154. On the site of the hunting lodge he founded an imperial palace he regarded as his favourite residence. In this palace were preserved the "Crown Jewels of the Holy Roman Empire", i.e. the jewelled imperial crown, sceptre, imperial orb, and sword of Charlemagne.
  Richard of Cornwall, King of the Romans, made it an imperial city in 1257. Subsequently, through Rudolph I of Germany — the first Habsburg emperor — Haguenau became the seat of the  of Hagenau, the German imperial advocate in Lower Alsace. In the 14th century, it housed the executive council of the Decapole, a defensive and offensive association of ten Alsatian towns against external aggression, economic expansion and related political instability. In the Peace of Westphalia in 1648, Alsace was ceded to France, which had repeatedly invaded and looted the region in the past. In 1673 King Louis XIV had the fortifications as well as the remains of the king's palace razed in order to extinguish German traditions. Haguenau was recaptured by German troops in 1675, but was taken again by the French two years later, when it was nearly destroyed by fire set by looting French troops.