Well, if that's your measure, then I'd wager it would likely be the one that worked at leading people astray with various "doctrines of demons", to coin a phrase.
And now, to bring this thread back on topic (a fool's errand if ever one existed, I fear), IMO the breathless anouncement of the "new planet" is most likely an attempt to breath some life -- in the form of money -- into the budget of the telescope that "discovered" the "planet".
In other words, since Hubble is scheduled to lapse into orbital decay as soon as nature decides to grasp it, those impacted (to coin another phrase) by the event decided to "discover" one of the fifty gazillion rocks out yonder and give it a name, thus calling attention to the telescope, without which this "planet" would not have been "discovered."
Look for the press conference make a point of how dramatic this "news" is, how it's only the tip of the iceberg (or start of the journey, or whatever; the particular metaphor doesn't matter), and, how, alas, we'll never know what we're missing, what's "out there", etc., because the coldhearted brutes have decided to allow Hubble to fall to Earth.
Not that I object to keeping the telescope in orbit, mind you. As much a waste of the taxpayer's money as it was, the "investment" as it were has been made, so we may as well try to make the best of it, and spend the relatively minor amount necessary to keep it there.
But then, I shed a virtual tear every time I think of those banks of silicon photocells burning up when a Mir or Skylab or other machine falls to Earth, destroying solar arrays I'd never be able to afford in a jillion years (even though I'm bled dry to pay for the arrays in question via taxes).
It's sad that we've been reduced to having one wing of government engage in such dramatics -- aimed at The Meat -- in an effort to prevail against another wing of government. It reminds me of the days of yore, when various royals did battle with others, in order to have the most claim over the labors of the commoners.
Some things never change. I rather suspect the annoying Mr. Noise Talk was one of them. If you ever do recall what lead up to his provoking the management into delivering his just deserts, please do not hesitate to share it.