I've heard that Rabeinu Gershom (a 10th-11th century scholar) banned 3 things, and I know one of them is polygamy. Does anyone know what the other two are?
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Be'er Hagolah at the end of Yoreh Deah 334 lists the following:
There are many more, see the link above.
I have heard that he wrote all of sha"s and said that that is the authoritative girsa and was gozer not the change it.
(from sefer פירושי רבינו גרשום printed by אור החיים, in the הקדמה)