December 5, 1976.
Inaxio Kortabarria and José Ángel Iribar lead their teams out onto the field in the Basque Derby.
Between them, they carry the Ikurriña - the then-illegal flag of the Basque Country.
With General Franco dead and his fascist dictatorship in chaos, this act of empowerment, defiance and self-determination sent shockwaves across the Basque Country and Spain.
48 years to the day since this iconic moment in football history.