Despite its iconic "medieval" appearance, Neuschwanstein was definitely not built first; in fact, it is one of the youngest castles in Germany. Construction only began in 1869 under King Ludwig II, long after the era of true defensive fortresses had ended. It was built as a "historicist" tribute to the Middle Ages, meant to be a private retreat rather than a military stronghold. For comparison, most of the "authentic" medieval castles you see along the Rhine or in the UK were built between the 11th and 14th centuries. Neuschwanstein was actually equipped with "ultra-modern" 19th-century technology, including flush toilets, a battery-powered bell system for servants, and central heating. By the time it was being built, some of its medieval inspirations—like the Wartburg Castle—were already nearly 800 years old.
No, Neuschwanstein Castle was not the first castle built by King Ludwig II of Bavaria. In fact, it was his third and most famous project.
Here’s the order of his major castle constructions:
Hohenschwangau Castle (Schloss Hohenschwangau):
Linderhof Palace (Schloss Linderhof):
Neuschwanstein Castle:
Herrenchiemsee Palace (Neues Schloss Herrenchiemsee):
In summary: The castle Ludwig grew up in