Citing "personal reasons," Fuentes left with the Basque club in danger of its first relegation from Spain's top league in 40 years. Real Sociedad is 18th with 33 points, four from Athletic Bilbao and safety.
Later Friday, the club's board will name a temporary replacement until a new president is elected by members on June 30.
War negates human nature and societal peace and harmony. H.G. Wells manifested the declaration of human rights in 1939 and wondered "What are we Fighting for?"