Lejre is a town with a population of 2,415 (1 January 2015) in Lejre Municipality (Danish, kommune) on the island of Zealand in east Denmark. It belongs to Region Zealand. The town's Old Norse name was Hleiðr or Hleiðargarðr. The municipality has an area of 240 km² and a total population of ca. 26,989 (2014). The municipal seat is Kirke Hvalsø.
Lejre was the capital of an Iron Age kingdom sometimes referred to as the "Lejre Kingdom." According to early legends, this was ruled by kings of the Skjöldung dynasty, predecessors of the kings of medieval Denmark. Legends of the kings of Lejre are known from a number of medieval sources, including the twelfth-century Gesta Danorum written by Saxo Grammaticus and the anonymous twelfth-century Chronicon Lethrense, or Chronicle of Lejre. As the home of the Skjölding (Old English Scylding) dynasty mentioned in Beowulf, Lejre has long been thought to have been the real-world counterpart to Heorot, the fabulous royal hall where the first part of the action of that Anglo-Saxon poem takes place. Among other works of the medieval imagination that tell of adventures at Lejre, the best known is the fourteenth-century Icelandic Saga of King Hrolf Kraki.
Archeological excavations undertaken since the 1980s have produced dramatic confirmation that medieval legends of Lejre, though largely fabulous, have a basis in history. Research teams led by archaeologist Tom Christensen of Roskilde Museum have uncovered the remains of an extensive Iron Age and Viking Age settlement complex just outside the hamlet of Gammel Lejre ("Old Lejre"). Discovered here were the post-holes for a series of large rectangular buildings measuring fifty to sixty meters in length or more. These must have been the halls of powerful magnates or kings. Outbuildings and other structures whose remains were unearthed in this same area indicate that Lejre was also a center for crafts, commerce, and religious observances. The relative absence of weapon finds suggests that the site was more important as a social and economic center than as a military base. A noteworthy loose find that has recently turned up, thanks to metal-detector work, is a tiny silver Viking Age figurine known as Odin from Lejre. This is thought to depict the god Odin enthroned in majesty between ravens.