Catalonia's drive for independence plunged Spain into its biggest political crisis for 40 years.
The region had its autonomy suspended for almost seven months by Madrid after a failed bid to break away in 2017.
In October 2019, Spain's Supreme Court sentenced nine Catalan politicians and activists to jail terms of between nine and 13 years for that independence bid. Three others were fined.
What is Catalonia?
Catalonia is a semi-autonomous region in north-east Spain with a distinct history dating back almost 1,000 years.
The wealthy region has about 7.5 million people, with their own language, parliament, flag and anthem.
Catalonia also has its own police force and controls some of its public services.
Why the controversy?
Catalan nationalists have long complained that their region sends too much money to poorer parts of Spain, as taxes are controlled by Madrid.
They also say Spain's changes to their autonomous status in 2010 undermined Catalan identity.
In a referendum on 1 October 2017, declared illegal by Spain's Constitutional Court, about 90% of Catalan voters backed independence. But turnout was only 43%.
The ruling separatists in the Catalan parliament then declared independence on 27 October.
Angered by that, Madrid imposed direct rule by invoking Article 155 of the constitution - a first for Spain.
The Spanish government sacked the Catalan leaders, dissolved parliament and called a snap regional election on 21 December 2017, which nationalist parties won.
Carles Puigdemont, the former Catalan president, fled but is wanted in Spain accused of rebellion, as are four who fled with him.
Quim Torra, a close ally of Mr Puigdemont, now leads the regional government.