The historical reliability of the Acts of the Apostles, the primary 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 1895-1915. German theologian Adolf von Harnack in particular was known for his strong criticism of Acts, though his allegations of its inaccuracies have been described as "exaggerated hypercriticism" by modern scholarship. Attitudes towards the historicity of Acts range widely across scholarship in different countries.