Golan Trevize is the protagonist in Foundation's Edge and Foundation and Earth.

At the beginning of Foundation's Edge, he is presented as a Foundation councilman who holds the true but unpopular view that the Second foundation still exists. For this he is exiled along with Pelorat. Pelorat finds a woman called Bliss on the living and conscious planet Gaia. Trevize discovers in the first novel that he must decide the fate of the galaxy. He decides for galaxy controlled by Gaia. He takes that decision due to his intuition and because he understands that Gaia's slow processes would allow him to change his decision. Foundation and Earth is the sequel to Foundation's Edge. On this book, he discovers why he decided for Gaia. It was to waard off intergalactic invasion by aliens, apparently.