The plaque commemorates Charles the XII during the Nordic War.
"Frankenkronwerk" is a part of the former city fortifications, which consisted of both solid city walls with city gates and bastions and ponds, which surrounded Stralsund since the middle of the 13th century and were intended to protect it from attacks. During the Swedish period, these fortifications were further expanded, as Stralsund was a bridgehead in Swedish Pomerania and its defense was therefore considered particularly important. The Swedish King Charles XII (1697-1718) is said to have often rested here in a niche in the wall of the Frankentor during the defense of Stralsund against Prussian, Saxon and Danish troops in 1715. A memorial slab made of Swedish limestone in the wall reminds with an inscription.
Charles XII won many battles, but lost the decisive ones. This was also the case here in Stralsund. Misjudging the situation, his goal here had been to restore the former balance of power in Swedish Pomerania. On December 23, 1715, however, the city had to capitulate after the king had fled to Sweden to avoid capture. Stralsund then became temporarily Danish before later returning to the Swedish crown.