A chronology of key events:
AD 803 - Emperor Charlemagne recovers area of present-day Andorra from Moors and is said to grant charter to its residents. After Charlemagne's death Andorra is granted to Spain's Count of Urgel by Charles II, grandson of Charlemagne.
Parliament building: Co-princes remain titular heads of state
1133 - Count of Urgel cedes Andorra to bishop of Urgel.
1278 - Under terms of "pareage" agreement, Andorra adopts joint allegiance to a French and a Spanish prince after disputes between French heirs to the Urgel countship and the Spanish bishops of Urgel.
1419 - Elected body, Council of the Land, is established to deal with local issues.
1607 - French royal edict establishes French head of state and bishop of Urgel as co-princes.
1866 - New Reform changes electoral system, heralds process of democratisation.
1933 - Judicial authority dissolves Council of the Land after unsuccessful attempt to install a king, "Boris I". French gendarmes sent to restore order and elections are held for new council.
1970 - Women given the vote.
1982 - First executive branch of government - "Govern" in Catalan - takes office. Its head is elected by Council of the Land.
1990 - Andorra signs customs union with EU.
1993 March - First constitution adopted by referendum. Document reduces feudal powers of two princes. New executive, legislative and judicial arms of government are set up. Andorra joins United Nations. France, Spain establish embassies.
1993 December - First general elections under new constitution. Ribas Reig elected as premier in January.
1994 December - Marc Forne Molne of Unio Liberal party becomes prime minister after resignation of Ribas Reig.
2001 - Marc Forne Molne re-elected.
2002 October - Controversy flares as government closes incinerator which had been exceeding EU emission levels 1,000-fold.
2005 April - Liberal Party again wins elections. Albert Pintat becomes premier.
2005 July - Cooperation agreement with EU comes into effect.
2009 March - Andorra agrees to ease banking secrecy rules to make it easier for other countries to pursue tax evaders and money launderers.
2009 April - General elections. Social Democrats win most votes but fail to gain a majority.
2009 June - Parliament elects Social Democrat leader Jaume Bartumeu Cassany prime minister.
2011 April - Opposition centre-right Democrats for Andorra coalition wins snap parliamentary election, defeating PM Jaume Bartumeu Cassany's Social Democrats.
2011 May - Antoni Marti of the Democrats for Andorra takes office as prime minister.