Even in modern times this has been used as a historical source.

This is one of the few primary historical sources for the period.

His name was first mentioned by historical sources in 1429.

Historical sources also say that the king was himself an authority.

There do not appear to be any historical sources which support this, however.

Even they found access to many important historical sources difficult or impossible.

They are regarded as a historical source for the time period.

Unfortunately, the primary historical sources for this period have been lost.

Even in historical sources, he has appeared as a historic figure.

And then he found that his historical sources were suddenly drying up.