Rationalist philosopher dude who lived a long time ago.
He basically
said that substance is god, or nature, and that every existing thing is one. That kinda made Christian Europe mad and they actually started using the word "Spinozist" as almost a swear word for "
atheist".
Then there was this huge intellectual controversy when Jacobi and Mendelssohn were both writing a
book about Lessing, who had just died, and they started exchanging letters about it and things got kinda heated when Jacobi took things a little too seriously and competed to have his
book printed first. Mendelssohn didn't get as aggresive as Jacobi, but the
poor dude ended up dead when he caught a
cold trying to send in his manuscript.
Anyway, the reason why this caused so much controversy was because Jacobi claimed that Lessing admitted to being a spinozist and Mendelssohn was friends with Lessing so everyone was like omg no way cause Mendelssohn was a leader of the Berlin Enlightenment and the starter of modern Judaism and being called an
atheist or pantheist wasn't exactly a good thing back then.
Long story short, Jacobi's
book got printed, in which he actually criticized Spinoza saying that
yeah, Spinoza may be right in his ideas but reason leads to atheism and denial of free
will so we should have faith. Or something like that. Bu interestingly enough, this criticism restarted an interest in Spinoza. And here we are
today, still talking about the dude.