Despite remains of prehistorical settlements and legends of a Roman foundation, the first mention of Militello dates from 1000 AD, when it became a marquisate under the Cammarana. The golden age of Militello was during the early 17th century, under the government of Prince Francesco Branciforte. The city was destroyed by an earthquake in 1693, but the subsequent restoration added numerous architectural and artistic works of art.
Together with other cities of the Val di Noto, Militello has been inscribed in the UNESCO World Heritage Sites List as one of the Late Baroque Towns of the Val di Noto.
References:The Château du Haut-Koenigsbourg is situated in a strategic area on a rocky spur overlooking the Upper Rhine Plain, it was used by successive powers from the Middle Ages until the Thirty Years' War when it was abandoned. From 1900 to 1908 it was rebuilt at the behest of the German kaiser Wilhelm II. Today it is a major tourist site, attracting more than 500,000 visitors a year.
The first records of a castle built by the Hohenstaufens date back to 1147. The fortress changed its name to Koenigsburg (royal castle) around 1157. The castle was handed over to the Tiersteins by the Habsburgs following its destruction in 1462. They rebuilt and enlarged it, installing a defensive system designed to withstand artillery fire.
The fortification work accomplished over the 15th century did not suffice to keep the Swedish artillery at bay during the Thirty Years War, and the defences were overrun.