Rayo Vallecano saw the light of day on 29 May 1924 in the hometown of Prudencia Priego, wife of the club\'s first president Julián Huerta. Greatly inspired by River Plate (a Football club from Argentina), in 1949, after an agreement with Atlético Madrid, a red diagonal stripe was added to the team\'s kit, and the club reached Tercera División for the first time in its history.\r\nn August 2015, Rayo Vallecano purchased the majority of Oklahoma City FC, a NASL expansion franchise which had yet to officially play a game renaming the club to Rayo OKC, despite the stadium increasingly needing work. It was the first ever entry of a Spanish club into the American sports market and mirrored a 2013 sponsorship agreement with Qbao in terms of expanding the club\'s profile overseas. Rayo OKC folded after a year or so due to Rayo Vallecano\'s relegation from the Primera División and a dispute between the co-o\r\nOne of the perennial yo-yo clubs of Spanish football, and always in the shadow of the two biggest clubs in the city (Real Madrid and Atlético Madrid), Rayo Vallecano spent many years during the 1980s and 1990s moving back and forth between La Liga and Segunda División. They appeared to have consolidated their top flight status after gaining promotion in 1999, and the team\'s most successful season came in 2000–01 when they reached the quarter-finals of the UEFA Cup, going out only to eventual runners-up Alavés; Rayo finished ninth in the previous campaign, but entered the competition via the fair play d
