The first rallies were held with Catalonia's sacked vice president Oriol Junqueras and three other separatist leaders still in prison after a Supreme Court judge on Monday turned down their request to be freed while they are investigated over their role in the wealthy northeastern region's independence drive.
Catalan leader Carles Puigdemont meanwhile campaigned by video conference from Belgium, where he escaped to after his region's parliament declared independence on October 27, claiming he would not get a fair trial at home.
Voters "can choose between nation or submission, they can choose between Catalan institutions or dark characters in Madrid", added Puigdemont, whose extradition has been requested by Spain.
Madrid wants to prosecute Puigdemont and the other jailed separatist leaders for rebellion -- which carries a maximum 30-year prison sentence -- and sedition for their role in the independence drive, as well as for misusing public funds.
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A yellow ribbon also occupied the empty chair reserved for Junqueras at his party's opening rally in the town of Vic about 100 kilometres further north.
Madrid called the new elections after the independence declaration, while dismissing Catalonia's government and suspending the region's autonomy. It hopes the polls will restore normality to the region.
Twelve of the 13 members of the sacked Catalan government are standing in the election, with Puigdemont and Junqueras competing to head the separatist camp.
While the separatists are united against what they say is "repression" from Madrid, they are divided over the future of their region.
Puigdemont's PDeCAT party and Junqueras' ERC ran on a joint list two years ago but are running separately this time around.
"Given the ongoing disagreements between secessionist parties over how to proceed, their leaders have an incentive to campaign on the ongoing grievances towards the central government while keeping their electoral programme vague," said Teneo Intelligence analyst Antonio Barroso.
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