In 1952 French Arabist Régis Blachère, author of a critical biography of Muhammad that took "fully into account the skeptical conclusions" of Ignác Goldziher and Henri Lammens, i.e that Islamic hadith had been corrupted and could not be considered reliable sources of information, wrote we no longer have any sources that would allow us to write a detailed history of Muhammad with a rigorous and continuous chronology. To resign oneself to a partial or total ignorance is necessary, above all for everything that concerns the period prior to Muhammad's divine call 610 CE. All a truly scientific biography can achieve is to lay out the successive problems engendered by this preapostolate period, sketch out the general background atmosphere in which Muhammad received his divine call, to give in broad brush strokes the development of is apostleship at Mecca, to try with a greater chance of success to pt in order the known facts, and finally to put back into the penumbra all that remains uncertain. To want to go further is to fall into hagiography or romanticization.