Jean-Guillaume de Neubourg-Wittelsbach
Immediately upon his accession in 1690, Johann Wilhelm, Elector Palatine had the walls and towers rebuilt. When the French again reached the gates of Heidelberg in 1691 and 1692, the town's defenses were so good that they did not gain entry. On 18 May 1693 the French were yet again at the town's gates and took it on 22 May. However, they did not attain control of the castle and destroyed the town in attempt to weaken the castle's main support base. The castle's occupants capitulated the next day. Now the French took the opportunity to finish off the work started in 1689, after their hurried exit from the town. The towers and walls that had survived the last wave of destruction, were blown up with mines.