The Rugii, Rogi or Rugians (Ancient Greek: Ρογοί, romanized: Rogoi), were one of the smaller Germanic peoples of Late Antiquity who are best known for their short-lived 5th-century kingdom upon the Roman frontier, near present-day Krems an der Donau in Austria. This kingdom, like those of the neighbouring Heruli and Sciri, first appears in records after the death of Attila in 453. The Rugii, Heruli, Sciri and others are believed to have moved into this region from distant homelands, and become part of Attila's Hunnic empire which also moved and came to be based in this region. The Rugii were subsequently part of the alliance which defeated Attila's sons and the Ostrogoths at the Battle of Nedao in 454, giving their kingdom independence. In 469 they were part of a similar alliance who lost to the Ostrogoths at the Battle of Bolia, weakening their kingdom significantly.
Many Rugii, once again along with Sciri, Heruli and other Danubians, joined Odoacer in Italy and became part of his kingdom there. Fearing new plots against him, he nevertheless invaded the Rugian kingdom in 487, and the Rugian lands were then settled by the Lombards from the north. Most Rugii still in the Danubian region eventually joined the Ostrogoth Theoderic the Great who killed Odoacer and replaced him with a Gothic-led regime in Italy. The Rugii were based in Pavia and played an important role in the Italian kingdom until it was destroyed by Justinian. The third last king was the Rugian Eraric who died in 541. After him these Rugii disappear from history.