In Norse mythology, the einherjar (singular einheri; literally "army of one", "those who fight alone")[1][2] are those who have died in battle and are brought to Valhalla by valkyries. In Valhalla, the einherjar eat their fill of the nightly resurrecting beast Sæhrímnir, and valkyries bring them mead from the udder of the goat Heiðrún. The einherjar prepare daily for the events of Ragnarök, when they will advance for an immense battle at the field of Vígríðr.
The einherjar are attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, the Prose Edda, written in the 13th century by Snorri Sturluson, the poem Hákonarmál (by the 10th century skald Eyvindr skáldaspillir) as collected in Heimskringla, and a stanza of an anonymous 10th century poem commemorating the death of Eric Bloodaxe known as Eiríksmál as compiled in Fagrskinna.
An etymological connection exists between the einherjar and the Harii, a Germanic people or figures from early Germanic folklore attested in the 1st century AD, and scholars have connected the einherjar to the eternal battle of Hjaðningavíg and the Wild Hunt. The einherjar have been the subject of works of art and poetry.