His wealth and social status are unclear from the extant sources.

All extant sources put the number of people killed in the billions.

The former, which ends in 1147, is a work of learning and industry, but almost entirely based upon extant sources.

The text does not name him; nor does any other extant source.

There are no extant sources (biblical or otherwise) to suggest the outcome of the argument.

Exactly why this happened is not clear from the extant sources.

They are considered lost and Orbin remains our earliest extant source for several of the events mentioned.

There are no other extant sources to verify this story...

There are very few extant sources of information on the individual trobairitz.

Place name study would at least suggest that but there are no extant written sources.