The issue of the parentage of Jesus in the Talmud affects also the view of his mother. However the Talmud does not mention Mary by name and is considerate rather than only polemic. The story about Panthera is also found in the Toledot Yeshu, the literary origins of which can not be traced with any certainty and given that it is unlikely to go before the 4th century, it is far too late to include authentic remembrances of Jesus. The Blackwell Companion to Jesus states that the Toledot Yeshu has no historical facts as such, and was perhaps created as a tool for warding off conversions to Christianity. The name Panthera may be a distortion of the term parthenos (virgin) and Raymond E. Brown considers the story of Panthera a fanciful explanation of the birth of Jesus which includes very little historical evidence. Robert Van Voorst states that given that Toledot Yeshu is a medieval document and due to its lack of a fixed form and orientation towards a popular audience, it is "most unlikely" to have reliable historical information.