On August 6, 1778, the lodge "Zur beständigen Einigkeit" was founded in Biebrich Palace under the chairmanship of the reigning Prince Carl Wilhelm von Nassau-Saarbrücken-Usingen. However, with the death of the Prince, the first Master of the Chair, Freemasonry also disappeared from Wiesbaden.

It was not until May 2, 1858 that the new lodge "Plato zur beständigen Einigkeit in Wiesbaden" was solemnly installed in the temple of the Frankfurt lodge "Zur Einigkeit". The name Plato shows the connection to the Frankfurt lodge "Sokrates zur Standhaftigkeit", which had given shelter to the Wiesbaden brothers.

In the 1920s, over 200 members ensured a steady lodge life, which came to an abrupt end during the National Socialist era: Freemasonry was banned and the lodges closed. The lodge house at Friedrichstraße 35, which was occupied in 1896, was completely destroyed in the air raid on Wiesbaden in February 1945.

After the war, the first meeting was held on the destroyed premises on September 10, 1948. The Haus der Heimat was eventually built on the site, where the lodge has continued to operate successfully since September 16, 1962.

On the occasion of the 200th anniversary, the magistrate received representatives of the Lodge in Wiesbaden Town Hall on October 21, 1978. Following speeches by the Lord Mayor and the Master of the Chair, the latter signed the city's Golden Book with its first and second Wardens.