which spanish team founded in 23 August 1923 was relegated to Tercera División.
1929 Segunda División:  Celta and Racing de Madrid were relegated to Tercera División. Celta de Vigo: Real Club Celta de Vigo (] ; "Royal Club Celta de Vigo"), commonly known as Celta Vigo or simply Celta, is a Spanish professional football club based in Vigo, Galicia, currently playing in La Liga. Celta de Vigo:  It was founded on 23 August 1923 following the merger of Real Vigo Sporting and Real Fortuna Football Club.
i don't know