The derby was first played in April 1909 and has attracted the attention of local football fans ever since. These two organisations are the largest football clubs in the Basque Country[1] and have stayed in the top division of Spanish football for longer than most clubs, winning several trophies in the last hundred years. Both enjoyed a period of great success in the early 1980s, winning four national titles in succession between them, whilst using only local players.[2][4]