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I know all of my ancestors who lived in the mid-18th century. I have over 2,000 names in my files, with places of birth and death, dates, occupation etc.
(Unfortunately I didn't find any prince or nobleman whatsoever in my ancestry. Only farmers, day labourers, craftsmen, especially carpenters... The most prestigious status I found was a sort of village lawyer who lived in Brittany cause he was the only literate one in the neighbourhood.)
My oldest registered ancestors were born in Normandy around 1540.
The only big problem I have is about my German/Luxembourgish/Lorrain branch in the early 17th century.
Investigating your own genealogy is unbelievably easy in France. Most departments offer all vital and parish records for free online (green districts):
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