Novial
Jespersen introduced  Novial in his book An International Language in 1928. He updated it in his dictionary Novial Lexike in 1930. He proposed several modifications in the 1930s. However, the language became dormant with Jespersen's death in 1943. In the 1990s, with the revival of interest in constructed languages brought on by the Internet, some people rediscovered Novial.