Has anyone climbed Everest solo?

Excuse me, I'm curious to know if anyone has ever successfully climbed Mount Everest all by themselves, without the assistance of a guide or a team? It's such an incredible feat of endurance and strength, I'm just wondering if it's been accomplished before. I've heard of people reaching the summit with the help of others, but I'm specifically interested in instances where someone has done it solo. Do you have any knowledge or information about this?