RESUMEN.: Vol. I. Introduction: autonomist parties in European politics. The partido nacionalista vasco: redefining political goals at the turn of the century. Eusko alkartasuna: a party in search of a third space. Convergencia I uniò: from stability to decline?. Esquerra republicana de catalunya: the third pole within catalan politics. The bloque nacionalista galego: from political oytcast to success. The partido andalucista: from autonomy to national-federalism and government. The scottish national party: the long road from marginality to blackmail and coalition potential. Plaid cymru-the party of wales: the new politics of welsh nationalism at the dawn of the 21 st. century. Vol. II. In memoriam the volksunie 1954-2001: death by overdose of success. The vlaams blok and the heritage of extreme-right flemish-nationalism. The union democratique bretonne: the limits of autonomist party expression in brittany. The ligue savoisienne: separatism in savoie. The svenska folkpartiet: the gradual decline of a language party. The fryske nasjonale partij: frisian and federal in the netherlands. The südtiroler volkspartei: from irredentism to autonomy. The partito sardo d#azione: regionalist mobilization in southern italy. The lega nord: towards electoral stability and modest success. Conclusion: the future study of autonomist and regionalist parties.