Hi,
I want to know where I can find data (databases / websites / encyclopedias etc...) of a possible past life.
Thanks.
Not sure what you mean by "possible past lives", but if you are interested in learning about your one special past life that is most significant to your current incarnation in order to understand better your present life's challenges and benefit from it on all levels you want - check out School of metaphysics at som.org
Here is the link https://som.org/intuitive-reports-offered/
SOM is one of the best in this field , many years ago they literally saved my twin brother's life providing him with exact information by intuitive health report.
They have trained personal who can access your past/present vibrations to give you precise reading. I am personally not a big fan of past life data/regression for I feel that the less I know about it the easier and sooner I will learn how to handle this present life. The more we know the more we get confused. Anyways good luck with your exploration!!!.