His first language was French, not a rare thing for people of his class at that time.
My maternal grandparents spoke perfect French, just like my wife's grandparents who came back to independent Poland from France. Generally, among educated people, it was a bit like English today. My granma taught me prayers in both French and Latin in mid 1980s! Cultural changes used to happen at a
much slower pace in the past.
A big mistake.
Depends how you look at it. He could hardly have predicted the WW2, PRL and all that, but still - Morskie Oko would definitely be outside Polish borders if it wasn't for Zamoyski and that's his lasting heritage. Nobody will remember current politicians in 50 years time, but people will still mention Zamoyski's name with respect in a 100 years and more.
The thread continues here:
https://polishforums.com/history/poland-historic-photos-context-88662/