In 1865, Domnitor Alexandru Ioan Cuza ordered the establishment of a gymnasium in Focșani, which took place the following January, making it among the country's first such institutions.
In 1880, work on the first dedicated building began; at the same time, the name changed from Cuza to Unirea, reflecting the association of Focșani with the union of the Principalities.
[1] In the interwar period, the school underwent material improvements, introducing a library room, a physics and chemistry amphitheater, laboratories for the same subjects and new classrooms.
[1] World War II brought further losses, and in 1948, the new Communist authorities ordered the destruction of "bourgeois" titles.
Also listed is a 1921 plaque carved by Oscar Späthe [ro] and dedicated to the students of Putna County who fell in World War I.