However, such claims are not corroborated by historical evidence. Other evidence later corroborated Townsend's identity. Accusations must be corroborated by at least two witnesses. Their confessions otherwise corroborated most of the evidence in the case. Some allegations have been corroborated, while others remain unverified. Eric's Northumbrian rule is also corroborated by numismatic evidence. These claims were not independently corroborated, and remained disputed. The findings were corroborated in part by a Gallup survey. Since then, these observations have been corroborated by several independent sources. Some "Augustan History" accounts are corroborated from other sources, and are more credible. Their reported obstacles and sightings were never corroborated by later parties. This accusation was later corroborated by the Venona tapes. However, this assertion, which comes from Fielding, has not been corroborated. These claims have not been corroborated. This has never been corroborated or authenticated.