UFC 266: Volkanovski vs. Ortega was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on September 25, 2021, at the T-Mobile Arena in Paradise, Nevada, part of the Las Vegas Metropolitan Area, United States.

Glover Lucas Teixeira is a Brazilian-American retired professional mixed martial artist. He competed in the Light Heavyweight division of the Ultimate Fighting Championship (UFC), where he is a former UFC Light Heavyweight Champion. Teixeira is a former member of the Brazilian National Wrestling Team and has competed in the WEC, Impact FC, PFC and Shooto. He is the second oldest UFC champion in history behind Randy Couture and the oldest first time champion in UFC history.