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The Uttarapurana, part of the Mahapurana, mentions eight sons of Sita, but not Lava and Kusha. Ravana, the son of Pulatsya, belonged to the lineage of the Vidhyadharas. He was called Ravana because he tormented his enemies.
As far as I know, this version of the Ramayana in the Uttarapurana is not prevalent in the Svetambara sect. I have read the Ramayana in Acharya Hemchandra's Trishatishalaka Purushacharita. It is completely in line with the story of the Paumachariya. It seems that both the Paumachariya and the Padmacharita were available to Acharya Hemchandra. As mentioned earlier, this story is also widely prevalent in the Digambara sect, and later poets have written their own works by summarizing or elaborating on this story. Nevertheless, the story of the Uttarapurana was not completely neglected. Many poets have used it as a model for their own poetry. For example, take the great poet Pushpadanta. The Ramayana he wrote as part of his Uttarapurana is an imitation of Gunabhadra's story. The same story is found in the Chamundarayapurana.
The story of the Paumachariya and the Padmacharita is largely in the style of Valmiki Ramayana, and the story of the Uttarapurana is in the style of the Janaki-Janma Adbhut Ramayana. The fact that Dasharatha was the king of Banaras is similar to the Buddhist Jataka. Like the Uttarapurana, it also does not include Sita's exile, the birth of Lava and Kusha, etc.
In other words, the two or three traditions of the Ramayana in India have been prevalent in the Jain sect since ancient times. The author of the Paumachariya has said that he is telling the Padmacharita, which was passed down through the tradition of the Acharyas and was written in the form of a list of names. I understand this to mean that the story of Ramachandra was only in the form of a list of names at that time, i.e., it would only have the names of the main characters, their parents, places, and previous births, etc., and not in the form of a developed story. He would have created it in the form of a detailed composition based on that list of names. What Shri Dharmasena Gani has said in the second part of Vasudevahindika also suggests that his Vasudevacharita was also designated according to the order of Ganitanuyoga. Some of it was based on the scriptures and some was based on the tradition of the Acharyas.
When Vimalsuri started writing his work according to the aforementioned list of names, it seems that there must have been some popular Ramayana in front of him, in which Ravana, etc., were described as demons, eaters of flesh and blood, and Kumbhakarna was said to sleep for six months at a time in such a way that even when elephants the size of mountains crushed his limbs, oil was poured into his ears, and drums were beaten, he would not wake up, and when he did wake up, he would swallow anything he found in front of him, including elephants, buffaloes, etc. This role of his indicates that at that time, the Valmiki Ramayana or a Ramayana like it was prevalent, and it contained many absurd, illogical, and unbelievable things, which Vimalsuri tried to make true, logical, and believable. The Jain religion had a framework based on a list of names in front of him, and there was also a story thread that came from the scriptural tradition or the tradition of the Acharyas. He would have created the Paumachariya based on that.
The author of the Uttarapurana came much later than him and Ravishena. Why he did not follow this storyline is a question. It is highly unlikely that he was not aware of these two works, and it is also less likely that he independently molded a popular story like Vimalsuri into the mold of Jainism, because his time is 955 CE, which is very
1. The Kannada Ramayana of Pampa and the Apabhramsha Ramayana of Svayambhu are based on the Padma Purana. 2. "Naamaavaliyanibaddha aayariyaparampraagayam savvam. Vocchaami paumachariyam ahaanapabbvim samaasena || 8 ||" 3. See Paumachariya Gatha 107 to 115.