George August studied in Giessen, Strasbourg and Paris, and later in England and Brabant.

During his Grand Tour, he visited several European courts; he was particularly impressed by the Palace of Versailles.

On 4 August 1688, Emperor Leopold I raised him to Prince as a reward for his services at Vienna, and also because he had paid a large sum of money.

[3] The city of Wiesbaden and the whole county of Nassau-Idstein had suffered badly during the Thirty Years' War and again during the plague in 1675.

He completed the residential palace in Idstein, he constructed the Herrengarten park and the Pheasants Park in Wiesbaden, he constructed a French formal garden on thebanks of the Rhine at Biebrich and he remodeled the City Palace at Wiesbaden.