Theravādin sources state that, in the 3rd century BCE, a third council was convened under the patronage of Aśoka. Some scholars argue that there are certain implausible features of the Theravādin account which imply that the third council was ahistorical. The remainder consider it a purely Theravāda-Vibhajjavāda council. It is generally accepted, however, that one or several disputes did occur during Aśoka's reign, involving both doctrinal and disciplinary ("vinaya") matters, although these may have been too informal to be called a "council". The Sthavira school had, by the time of Aśoka, divided into three sub-schools, doctrinally speaking, but these did not become separate monastic orders until later.