sentences:  Thapan reviews different views on dating and states her own judgement that it appears likely that the core of the "Ganesha Purana" come into existence around the 12th and 13th centuries, being subject to interpolations during the succeeding ages.Thapan notes that these Puranas, like other Puranas, developed over a period of time as multi-layered works.Lawrence W. Preston considers that the period AD 1100–1400 is the most reasonable date for the "Ganesha Purana" because that period agrees with the apparent age of the sacred sites in Nagpur and Varanasi areas mentioned by it.