Although there has been quite a bit of confusion in regard to the historical Acharya Shantideva, including questions about the original number of chapters and various dates assigned to the Bodhicaryavatara, this appears to be more related to the Tibetan tradition and an over-all failure within Buddhist scholarship to examine the historical record of southeastern Bangladesh, the region which has always been associated with Acharya Shantideva.
Offering not only a documented history, but also an anchoring point within the development of Mahayana Buddhism, there were two different individuals in the Samatata territory of southeastern Bangladesh named "Shantideva" and both would leave their mark on Buddhism as it was practiced in the region.
The first to appear within Bengal history is the Acharya Shantideva of the Indian Madhyamika tradition, the founder of the Avaivartika Sangha in the 6th century, and he should be considered the author of the Bodhicaryavatara in it's original composition of nine chapters, while his namesake, the later Shantideva who is identified within the Tibetan tradition as a student at the university of Nalanda in the 8th century, could only have expounded on the Bodhisattva ideal from within the understanding of his predecessor and should be considered the author of the post-dedication which would become the tenth chapter of the Bodhicaryavatara.
The Bodhicaryavatara actually offers evidence of the tenth chapter as a post-dedication in the opening verse of the chapter itself: "May all sentient beings be graced with the Bodhisattva way of life by the virtue I have obtained while reflecting on the Bodhicaryavatara", which refers to an existing composition at the time that the tenth chapter was added, but this verse, as well as others, suffered in the Tibetan translation due to linguistic limitations and is only apparent in the Sanskrit original.
It should also be noted that the Bodhicaryavatara appears to be a "primer" for the instruction of novices, the same purpose as the Siksasamuccaya, which is also attributed to Acharya Shantideva: "There is nothing here that has not been said before, nor do I have any skill in composition. Thus, I have no concern for the welfare of others, and I have composed this solely to season my own mind." (BCA 1:2)
While many of the variations found within Tibetan versions of the Bodhicaryavatara are minor, as shown above, they become critical in the eighth and ninth chapters, where even Stephen Batchelor has rejected his English translation derived from Tibetan sources and voiced concerns over the erroneous footnotes which continue to appear with each reprint of the edition which bears his name.
Upon a closer examination of the Tibetan tradition, one immediately notices a re-assessment of the importance of the Bodhicaryavatara, beginning when the first Tibetan lamas came to the West and discovered two very popular books already in print: the Tibetan Book of the Dead (Bardo Thodol), which actually has nothing to do with Buddhism, and the Bodhicaryavatara translated from Sanskrit.
It is only at this point that the Tibetan claim of possessing an indepth realization of the Bodhicaryavatara comes to the surface and takes on a life of it's own, not before. This is also evident when one compares Acharya Shantideva to Atisha Dipankar, where the latter's historical writings can barely be distinguished from the apocryphal and tantric literature attributed to him within Tibetan Buddhism, but there is no such literature attributed to Acharya Shantideva.
Such statements should not be taken out of context, as there are many excellent Tibetan commentaries related to the practice of Bodhisattva Dharma, but it needs to be stated that no tradition withstands historical truth, not even under the guise of expedient means.
With this in mind, the Bodhicaryavatara Historical Project would also undertake a critical examination of the Dharma Treasury of the Golden Mouth of the Buddha, which represents not only the early transmission lineage that was later incorporated within Chan Buddhism, but it provides a rare glimpse into the earliest tradition regarding the last three adopted "patriarchs" of this lineage:
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Manorhita divided the land into two parts at the
Ganges River and he himself taught those in one part.
The Dharma was then transmitted to Haklenayasa and then to Simhabodhi.
Simhabodhi was executed by the evil King Dammira in Kashmir and when the
sword cut off his head, milk flowed forth instead of blood.
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By all accounts Simhabodhi's martyrdom occurred in the middle of the first decade of the 6th century (505/506 CE) and this evil King Dammira can be none other than Mahir-Gul of the Huns, as he is the only tyrant recorded in this period of Kashmir history. To say that Mahir-Gul was "evil" would be an understatement, as he would have been a kindered spirit and suitable role model for Vlad Tepes, better known as Vlad the Impaler, the historical prince of Wallachia who served as the inspiration behind Bram Stoker's "Dracula".
Mahir-Gul's arrival in Kashmir in 501 CE is recorded with the description of thousands of vultures and crows in the sky, feeding on the bodies of those being massacred by his encircling army, as well as his infamous depravity in having pushed a herd of one hundred elephants off of the Pir Panchal Pass outside of Kashmir, just so he could hear their agonizing screams as they lay dying at the bottom.
It is within this history that we find not only the world in which Acharya Shantideva lived, as well as the catalyst that would lead to the composition of the Bodhicaryavatara, but also a timely confirmation that a realized Bodhisattva is not "made" or created through empowerments and rituals, but that he or she is forged in the fires of human suffering --- the same fires which continue to ravish the world today, fueled by ignorance, intolerance, and greed.

Any questions in regard to the historical Acharya Shantideva and the veracity of the Tibetan tradition were answered through a series of archaeological discoveries, beginning with the Gunaighar Grant Copperplate
in 1925, which records not only the donation of land to the Avaivartika Sangha, but also mentions Acharya Shantideva by name in the 188th Year of the Gupta Era (506 CE).
Although the first published report on the copperplate contained several errors --- with the most obvious one being "Va [ya] vartika", designating the difference between Buddhist Non-Duality and that of the Brahmic (to not fall back in illusion) --- it appears that the author of the report was aware of the tradition of an independent Madhyamika school, but he was clearly more familiar with the Tibetan pseudo-biographies, the historical value of which would be later challenged by academia in general: