A daina is a short unrhymed Latvian folk song, usually four lines in a fixed metre, and there are hundreds of thousands of them. Krisjanis Barons spent decades from the 1870s receiving texts sent in by correspondents across the country, sorting each one onto a slip of paper and filing it in a purpose built cabinet of small drawers. The Dainu skapis, the cabinet of songs, is a physical object in Riga and it is inscribed on the UNESCO Memory of the World register. The published edition ran to six volumes.
What the corpus contains is not a mythology in the narrative sense. There are almost no stories. There are figures who recur in a dense web of imagery: Dievs, the sky god whose name is simply the word for god; Mara, associated with the earth, cattle, birth and material provision, and thoroughly entangled with the Virgin Mary in ways nobody can fully disentangle; Laima, who determines fate at birth; Saule the sun, feminine, and her daughters. The material is agricultural and calendrical, organised around the working year and the life cycle rather than around a cosmogony.
Dievturiba was founded on this corpus by Ernests Brastins in 1925, as a deliberate attempt to reconstitute a Latvian national religion from the songs. It was suppressed under Soviet rule, Brastins died in the Gulag, and the movement re registered after independence. It remains small.
The wider inheritance is not the movement but the calendar. Jani, the midsummer celebration on the shortest night, is a public holiday observed by most of the country, with its wreaths, its cheese, its bonfires and its songs, and it is not principally understood as a religious event by the people keeping it.