I too would like be enlightened, I'm not a lawyer but I 'd like to feel smarter, knowing the names of some cases and what was decided.

The other comment's Wikipedia link had footnotes for "Percival vs Wright [1902]" and "Coleman v Myers [1977]", but these are UK and New Zealand cases.

For the US, https://en.wikipedia.org/wiki/Fiduciary#Fiduciary_duties_und... seems most appropriate wiki link but most of the footnotes were for analysis and not cases.