Roberto González Cruz was a Mexican professional wrestler who wrestled under the name El Solitario. During his career he held both the NWA World Light Heavyweight Championship and the NWA World Middleweight Championship. After achieving stardom in Mexico's oldest promotion, Empresa Mexicana de Lucha Libre, Gonzalez Cruz joined the breakaway promotion, the Universal Wrestling Association, where he held four more world championships in the early 1980s.

The NWA World Light Heavyweight Championship was a professional wrestling championship sanctioned by the National Wrestling Alliance (NWA). For the majority of its existence the title was promoted by Mexican promotion Consejo Mundial de Lucha Libre (CMLL), where it was known in Spanish as the Campeonato Mundial Semi Completo de NWA. It began as an official National Wrestling Alliance (NWA) title and was given to the NWA's Mexican affiliate, Empresa Mexicana de Lucha Libre, to control. The title was also promoted in NWA Hollywood Wrestling until Hollywood Wrestling's closure in 1982. The title remained under the control of EMLL even after EMLL pulled out of the NWA and changed its name to Consejo Mundial de Lucha Libre. Due to its history, it was considered one of the most important titles in EMLL/CMLL. As it was a professional wrestling championship, it was not won legitimately; it was instead won via a scripted ending to a match or awarded to a wrestler because of a storyline. The official definition of the light heavyweight weight class in Mexico is between 92 kg (203 lb) and 97 kg (214 lb), but this was not always strictly enforced.