It is situated in the bottom of the Valley of Boí. The engine of its economy is the tourism. In 2005 had 262 inhabitants. In 806 the Count of Tolosa freed the region from the Muslim domination and from the tribute they had to pay. Later, the Valley of Boí was given to the Country of Pallars, dependent on the Church of Urgell.In 911, after a serious conflict with the Church of Urgell, a bichopric was established which included the countries of Pallars and Ribagorça.In 949 both countries separated, Ribagorça remained in the new bishopric while Pallars came back again under the Church of Urgell. Further juridic conflicts make both countries join again and until the early 12th century the stability didn't reach the region. It was at this time when the region was favored by Alfons I "El Batallador", because the direct participation of region's Lords in his reconquest campaign, becoming improved and gaining wealth. Lord of Erill had the villages of Taüll and Boí under his jurisdiction, and was this period of wealthy what allowed all the rustic churches in the valley to be renewed, being replaced by others of romanesque construction, richly decorated and with outstanding liturgical furniture. The churches of Sant Climent, Sant Martí (destroyed by an avalanche in the seventies) and Santa Maria where constructed in Taüll.Lords of Erill were a very important barony in the Pirenees. They are known because they planned the construction of the churches in the Valley of Boí. The valley was dominated by the Erills and they had the castle in the nowadays abandoned village of Erillcastell. The name of Taüll means ATA-ULI ("the peak of the village")