Charles de Tinseau d'Amondans

He entered in the École du Génie at Mézières (the Military School of Artillery of France) in 1769 and he graduated in 1771.

Apparently not de Gua, neither Tinseau can have the paternity of a theorem stated by Descartes in 17th century.

[3] From 1789, after the French Revolution, he lived in exile due to his radical monarchic convictions.

He was in permanent contact with Charles-Philippe (the future king Charles X of France), being his personal aide-de-camp.

[4] From 1792 he published several politic pamphlets defending the borbonic monarchy against the power of the Etats Generaux.