IIRC, for Japanese people, even Teineigo is part of Keigo. In learners' resources (where Teineigo is introduced usually right at the start), my impression is t

IIRC, for Japanese people, even Teineigo is part of Keigo. In learners' resources (where Teineigo is introduced usually right at the start), my impression is that Teineigo is not included, and that Keigo starts with Sonkeigo and Kenjougo. That's still introduced comparatively early, but much later than Teineigo (I think, it's in Genki 2, for example).