Ukko, Äijä or Äijö, parallel to Uku in Estonian mythology, is the god of the sky, weather, harvest, and thunder in Finnish mythology.
Painting by Robert Ekman in 1867 called Lemminkäinen tulisella järvellä where Lemminkäinen asks help from Ukko ylijumala with crossing the lake in fire on his route to the wedding at Pohjola.
Ukonkivi (Ukko's rock) in Lake Inari in Lapland. Ukonkivi was a holy site to the local Sami. Archeological finds, apparently offerings, have been found at site.
Corded Ware culture boat-shaped battle axe from Närke, Sweden.
Simplified drawing of a stone carving type found in Karelia, which is believed to have characteristics of both snakes and lightning.
The birch bark letter given the document number 292 is the oldest known document in any Finnic language. The document is dated to the beginning of the 13th century. It was found in 1957 by a Soviet expedition led by Artemiy Artsikhovsky in the Nerevsky excavation on the left coast side of Novgorod. It is currently held at the Novgorod City Museum.
Birch-bark letter No. 292