A person whose identity was not known to him and whose very existence remained to be proved?

The existence of some of these places or items, particularly those from ancient history, is legendary and remains in doubt.

So the continued existence of the species, Man, remains in doubt.

The existence or otherwise of this origin is, as yet, unknown in this twentieth century, and may remain so forever.

Several testimonies describe the existence of very extensive and dense Roman building remains before 1977.

There are many witness reports but the creature's existence remains to be established conclusively.

Darlington's existence remains in doubt after a day of meetings ended with no solid result.

Darlington's existence remains in critical doubt after a day of meetings to discuss keeping the club alive ended with no solid result.

The existence of two different castles in the city remained until 1722.

All the while, the administration was sensitive that the existence of the accord remain out of public purview.