What Are the Early Origins of Grammar Schools?

The first school in china even came before that, but that's the those are the kind of early origins that we know about. What were these sort of grammar schools then? When did the grammar school start being tha thing that most children went to? Ok, so that happened quite a lot later. The number of grammar schools er by te you got to, you know, kind of shakespeare's time, the tudors, the stuarts. You're getting into he 16 hundreds.