A historical theorem finally proved by Andrew Wiles. He deserves all my deepest respect and admiration. I also extend this admiration and respect to all mathematicians of today and yesterday. I graduated in Mathematics from the Autonomous University of Barcelona since 1988. Currently I'm a teacher of different mathematics subjects at university level. During these years, I have published many books. These books are available around the world in university libraries and also in any bookstore. This book is a bit different from the previous ones, as it presents the discovery of what could be a surprisingly simple proof of Fermat's last Theorem. I developed this demonstration in 1998, but I never thought to disclose it until now. And I've decided to disclose it now because someone recently reminded me that it was kept in a drawer, and perhaps the world should know. Feel free to study it, analyze it and contact me with your opinions, if you want. For me, all your comments will be welcome.