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They go on trial on Tuesday to face charges related to the illegal independence referendum in October 2017.
Catalonia celebrates "La Diada" today, and separatists are marking the occasion with a show of strength in the streets. It's the first National Day since the region declared independence last year and kicked off constitutional chaos.
Mediators appealed for reconciliation at a ceremony to formally end ETA's bloody campaign for Basque independence
The end of ETA and post-Brexit budget battles in Brussels
The group killed around 850 people trying to gain independence for northern Spain and southern France.
ETA killed 853 people in its armed campaign to create an independent Basque state in northern Spain and southern France.
European intervention in the Catalan crisis is unavoidable amid a systematic bias against secession in the interpretation of Spanish law, says an advisor to the European Parliament.