Allegewi (also Alligewi or Talligewi, or other variants) is the name of a purported ancient Native American people associated in tradition with the construction of prehistoric earthworks and fortifications in the Mississippi and Ohio River valleys. Although commonly identified in 19th-century sources as a "giant race" encountered and expelled by migrating Lenape and Iroquois peoples, the historical existence of the Allegewi is widely disputed by modern scholars and regarded as part of Native oral tradition, settler mythmaking, and early attempts at ethnological explanation of the so-called Mound Builders.