Ronaldo Souza, commonly known as "Jacaré," is a Brazilian mixed martial artist and former professional MMA fighter. Born on December 7, 1980, in Campinas, Brazil, he is renowned for his exceptional grappling skills and has competed in various organizations, including the UFC and Strikeforce. Souza is a black belt in Brazilian Jiu-Jitsu and has won multiple championships in the sport. Throughout his career, Souza has faced many top fighters and has earned a reputation as one of the best middleweights in MMA history. He has notable victories over fighters like Vitor Belfort and Chris Weidman, showcasing his ability to compete at the highest level.