Modula a.k.a. Modula-1 (the -1 was retroactively applied by some when Modula-2 came out, in order to allow distinguishing the family of Modula languages, with the first dialect in that family).
Please see Wirth (1977): "Modula: A language for modular multiprogramming". Software--Practice and experience, 7:3--35.
It was succeeded by ModulaTwo.