According to wikipedia, Xi Shi was born is 506 BCE; her death date is uncertain. Indeed the facts of her death are quite vague.
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it is... XI/XI/MCXV
XI I MMIX
I think it is VI XI MCMXCVIII but i am not too sure. However, I have checked my answer!
birth rate - 295 death rate - 876 rg
I don't know how Romans would have written dates of birth but written the same way as you have, it would be: XI I MCMLXXXIII