The historical reliability of the Acts of the Apostles, the principal historical source for the Apostolic Age, is a major issue for biblical scholars and historians of Early Christianity, with the debate on the historicity of Acts becoming most vehement between 1895 and 1915. German theologian Adolf von Harnack in particular was known for being very critical of the accuracy of Acts, though his allegations of its inaccuracies have been described as "exaggerated hypercriticism" by some. Attitudes towards the historicity of Acts range widely across scholarship in different countries.