John Frederick von Schwarzburg-Rudolstadt was the only son of Frederick Anton, Prince of Schwarzburg-Rudolstadt and his first wife, Princess Sophia Wilhelmina of Saxe-Coburg-Saalfeld. John Frederick mastered the French language. Between 1738 and 1742, John Frederick made a Grand Tour. He attended lectures on theology at the University of Strasbourg and lectures on mathematics and physics at the University of Utrecht. During his Grand Tour, he came into contact with the ideas of the Age of Enlightenment. He later tried to reconcile these ideas with his faith. In 1742, John Frederick represented his father at the coronation of Emperor Charles. The ceremony in Frankfurt Cathedral lasted several hours and John Frederick found it very impressive. In 1744, at the age of 23, he inherited the Principality of Schwarzburg-Rudolstadt. He continued the Heidecksburgconstruction project his father had begun. His father had built the exterior of the castle, John Frederick took up decorating the interior. He commissioned frescoed ceilings and overdoor ornaments. In 1750, the ballroom was completed by Gottfried Heinrich Krohne. It is considered a prime example of Rococo interior design in Germany. The princely collection of sheet music had been lost in a fire in 1735. John Frederick started a new collection to replace it. Georg Gebel composed at least nine opera libretti and about a hundred symphonies, partitas and concerts. In 1746, John Frederick rewarded him with the title of Concertmeister and in 1750 with the title of Kapellmeister. In 1754, Christian Gotthelf Scheinpflug succeeded gebel as Kapellmeister. He composed music for all kinds of courtly occasions. In 1746, he founded a theological seminary and supported the founding of an extensive public library. He added his private library to the existing collection and from 1751 onwards, he allowed the general public to access it once a week. He considerably extended the collection of the "Princely public library Rudolstadt", founded in 1748, be purchasing scientific literature and numerous valuable books, incunables and oriental manuscripts. The collection is currently split between the Historischen Bibliothek der Stadt Rudolstadt, and the Schlossbibliothek Heidecksburg. On 4 October 1760, John Frederick granted a license to operate a porcelain factory to Georg Heinrich Macheleid. John Frederick himself acted as a director for this company, which still exists under the name of Aelteste Volkstedter Porzellanmanufaktur. On 20 January 1764, the localgymnasium celebrated its centenary. On this occasion, John Frederick officially named the building Gymnasium Friedericianum and added a position teaching mathematics and physics. The ceremony was attended by the Prince and the entire princely household. John Frederick died on 10 July 1767. As he had no male heir, he was succeeded by his uncle Louis Günther II. In 1763, Louis Günther II's eldest son, the new Crown Prince Frederick Charles, had married John Frederick's eldest daughter, Frederike.
