By "peers," I mean contemporary heads of state. By "no more education than him," I mean "no more than secondary education." (He dropped out of secondary school at a young age, but later finished). Two people that he interacted with a lot, Mussolini and Stalin, appear to have "some college," but it appears to me that one or both did not "graduate."

Hitler's level of education was "average" for this time. Most heads of state, however, went further in their studies, and had more formal education than Hitler. So the question is, which ones (if any) did not?