Athletic Club (Basque: Bilboko Athletic Kluba; Spanish: Athletic Club de Bilbao), commonly known abroad as Athletic Bilbao (Spanish: Athletic de Bilbao), or simply as Athletic domestically, is a professional football club based in the city of Bilbao in the Basque Country, Spain. They are known as Los Leones (The Lions) because their stadium was built near a church called San Mamés, which was named after Saint Mammes, an early Christian thrown to the lions by the Romans. Mammes pacified the lions and was later made a saint. The team plays its home matches at the San Mamés Stadium.
https://en.wikipedia.org/wiki/Athletic_Bilbao