Oh, look what you did, now you made me go all geeky! LOL.
Sorry, but technically they were Sith,
not Jedi.
I know, Sith originally started from a "Dark Jedi", but I think after a few thousand years they can be considered separate "Faiths", especially since they have completely opposing views on the "Force". :icon_lol:
http://www.starwars.com/databank/org...ith/index.html
BTW, Palpatine was never a Jedi at any time in his life.
He had always been trained as a Sith, by his master Darth Plagueis.
Thus his true title/name is actually "Darth Sidious", and of course he became a master after he off'd his master.
Vader was a just convert. LOL.
More useless information than you wanted to know...
So I defend my original statement. :icon_lol:
(All done in fun)