The fate of Catalonia's high-profile secessionist movement had hung in the balance since regional, parliamentary elections in September, as the pro-independence faction that won the polls bickered bitterly over who should lead the new local government.
The focus of in-fighting was Artur Mas, the incumbent, separatist regional president whom the far-left CUP party -- part of the secessionist faction that won the elections -- rejected over his support for austerity and corruption scandals linked to his party.
But at the last minute, Mas unexpectedly agreed to step aside on Saturday, naming relatively unknown journalist and politician Carles Puigdemont as his successor and thus resolving the deadlock.
On Sunday evening, separatist members of the regional parliament will confirm the selection of Puigdemont, a Catalan-language journalist from Mas's party.
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The 53-year-old mayor of Girona, which lies some 100 kilometres northeast of Barcelona, will then appoint his cabinet.
Incumbent Prime Minister Mariano Rajoy's conservative Popular Party (PP) came top in the December 20 elections but lost its absolute majority, leaving him struggling to form a government.
So far both the PP's traditional Socialist rivals (PSOE), who came second in the elections, and upstart anti-austerity party Podemos have refused to support him.
"The (separatist) coalition is profiting from the power vacuum in Madrid," headlined online daily El Espanol on Sunday.