Riga is the capital of Latvia and is home to 627,487 inhabitants (2020), which is a third of Latvia's population. Being significantly larger than other cities of Latvia, Riga is the country's primate city. It is also the largest city in the three Baltic states and is home to one tenth of the three Baltic states' combined population. The city lies on the Gulf of Riga at the mouth of the Daugava river where it meets the Baltic Sea. Riga's territory covers 307.17 square kilometres (118.60 sq mi) and lies 1–10 m (3 ft 3 in–32 ft 10 in) above sea level, on a flat and sandy plain.
In 2016, Riga received over 1.4 million visitors. The city is served by Riga International Airport, the largest and busiest airport in the Baltic states. Riga is a member of Eurocities, the Union of the Baltic Cities (UBC) and Union of Capitals of the European Union (UCEU).
The river Daugava has been a trade route since antiquity, part of the Vikings' Dvina-Dnieper navigation route to Byzantium. A sheltered natural harbour 15 km (9.3 mi) upriver from the mouth of the Daugava — the site of today's Riga — has been recorded, as Duna Urbs, as early as the 2nd century. It was settled by the Livs, an ancient Finnic tribe.
Riga began to develop as a centre of Viking trade during the early Middle Ages. Riga's inhabitants occupied themselves mainly with fishing, animal husbandry, and trading, later developing crafts (in bone, wood, amber, and iron).
The Livonian Chronicle of Henry testifies to Riga having long been a trading centre by the 12th century, referring to it as portus antiquus (ancient port), and describes dwellings and warehouses used to store mostly flax, and hides. German traders began visiting Riga, establishing a nearby outpost in 1158.
Along with German traders the monk Meinhard of Segeberg arrived to convert the Livonian pagans to Christianity. Catholic and Orthodox Christianity had already arrived in Latvia more than a century earlier, and many Latvians had been baptised. Meinhard settled among the Livs, building a castle and church at Uexküll (now known as Ikšķile), upstream from Riga, and established his bishopric there. The Livs, however, continued to practice paganism and Meinhard died in Uexküll in 1196, having failed in his mission. In 1198, the Bishop Berthold arrived with a contingent of crusaders and commenced a campaign of forced Christianization. Berthold died soon afterwards and his forces were defeated.
The Church mobilised to avenge this defeat. Pope Innocent III issued a bull declaring a crusade against the Livonians. Bishop Albert was proclaimed Bishop of Livonia by his uncle Hartwig of Uthlede, Prince-Archbishop of Bremen and Hamburg in 1199. Albert landed in Riga in 1200 with 23 ships and 500 Westphalian crusaders. In 1201, he transferred the seat of the Livonian bishopric from Uexküll to Riga, extorting agreement to do this from the elders of Riga by force.
