Interlingue
De Wahl announced his language in the magazine Kosmoglott in 1922, and this is where the Occidental activities can be seen. However, de Wahl started making the language long before this. Between 1906 and 1921 he started experimenting with his own language, and it changed a lot. At the time he called it Auli, or "auxiliary language" (auxiliary means helpful). The other nickname for Auli is proto-Occidental (which means "old Occidental"). When de Wahl announced his language in 1922, it was almost but not quite done. He actually wanted to wait a bit longer, but there was big news in 1921: the League of Nations was looking at the idea of an international language. De Wahl had also sent a letter and got a positive reply from the League of Nations in September 1921.