The Comintern's historical existence is divided among periods, regarding changes in the general policy it followed.

Little is known of his life, leading some scholars to doubt his historical existence as a real person.

Each of these different 'levels' does not have the same type of historical existence.

Most ancient sources accept his historical existence; Aristotle is an exception.

There can, at least, be absolutely no doubt about his historical existence.

Various sources present Mahādeva as playing different roles, and the historical existence of such a person is often criticized.

The historical existence of any of these events or persons is conjectural.

Evidence for her actual historical existence or acta is very sparse.

Nations' will control their historical existence when human society controls its social process.

However, very little is known about Kitara; some scholars even question its historical existence.