Convergencia i Unió was a centre-right Catalan nationalist party that dominated Catalan politics from 1979 to 2015. With Jordi Pujol as president it held the regional government from 1980 to 2003, and again, from 2010 to 2015, with Artur Mas as president. CiU also provided critical support for various Spanish governments, both Socialist Party and Popular Party, when aditional votes were needed to secure parliamentary majorities in Madrid.
After revelations of corruption involving various members of the Pujol family, including accounts held abroad by former president Jordi Pujol and the shift towards independence of the party, both components split in 2015. Convergencia, the stronger partner, led by Artur Mas, finally re-branded as PdeCat (Democratic European Catalan Party), and as such holds a representation in the Spanish parliament. When the September 2015 “plebiscitary election” was called in Catalonia, they joined forces with ERC (Catalan Republican Left) and civil society organisations to form Junts pel Sí (Together for Yes). The latter won the elections with 40% of the vote, but in order to form a government they needed the supportive vote of anti-capitalist CUP, who imposed as a condition that Artur Mas not renew as president. Former mayor of Girona carles Puigdemont was then elected president by a parliamentary majority including Junts pel Sí and CUP, but Junts pel Sí alone was to govern, until ousted by Rajoy’s application of Article 155.