Idistaviso is the location on the Weser river

Weser River

The Weser is a river in north-western Germany. Formed at Hann. Münden by the Fulda and Werra, it flows through Lower Saxony, then reaching the historic port city of Bremen before emptying into the North Sea 50 km further north at Bremerhaven, which is also a seaport...

 where forces commanded by Arminius

Arminius

Arminius , also known as Armin or Hermann was a chieftain of the Germanic Cherusci who defeated a Roman army in the Battle of the Teutoburg Forest...

 fought those commanded by Germanicus

Germanicus

Germanicus Julius Caesar , commonly known as Germanicus, was a member of the Julio-Claudian dynasty and a prominent general of the early Roman Empire. He was born in Rome, Italia, and was named either Nero Claudius Drusus after his father or Tiberius Claudius Nero after his uncle...

 at the Battle of the Weser River

Battle of the Weser River

The Battle of the Weser River, sometimes known as a first Battle of Minden, was fought in 16 AD between Roman legions commanded by Emperor Tiberius' heir and adopted son Germanicus, and an alliance of Germanic tribes commanded by Arminius...

 in 16 CE, attested in chapter 16 of Tacitus

Tacitus

Publius Cornelius Tacitus was a senator and a historian of the Roman Empire. The surviving portions of his two major works—the Annals and the Histories—examine the reigns of the Roman Emperors Tiberius, Claudius, Nero and those who reigned in the Year of the Four Emperors...

' Annales

Annals (Tacitus)

The Annals by Tacitus is a history of the reigns of the four Roman Emperors succeeding Caesar Augustus. The surviving parts of the Annals extensively cover most of the reigns of Tiberius and Nero. The title Annals was probably not given by Tacitus, but derives from the fact that he treated this...

II. The name was amended by Karl Müllenhoff

Karl Mullenhoff

Karl Viktor Müllenhoff was a German philologist and a student of Teutonic antiquities.-Biography:...

 and Jacob Grimm

Jacob Grimm

Jacob Ludwig Carl Grimm was a German philologist, jurist and mythologist. He is best known as the discoverer of Grimm's Law, the author of the monumental Deutsches Wörterbuch, the author of Deutsche Mythologie and, more popularly, as one of the Brothers Grimm, as the editor of Grimm's Fairy...

 in the 19th century to Idisiaviso, meaning "plain of the Idisi

Idis (Germanic)

In Germanic mythology, an idis is a divine female being. Idis is cognate to Old High German itis and Old English ides, meaning 'well-respected and dignified woman.' Connections have been assumed or theorized between the idisi and the North Germanic dísir; female beings associated with fate, as...

" or "women's meadow".

Theories

Rudolf Simek states that "as the Idisi are supposed to have an influence in the outcome of a battle, similarities with the valkyrie

Valkyrie

In Norse mythology, a valkyrie is one of a host of female figures who decides who dies in battle. Selecting among half of those who die in battle , the valkyries bring their chosen to the afterlife hall of the slain, Valhalla, ruled over by the god Odin...

s suggest themselves. Idisiaviso would thus be a place at which the Idisi had once been instrumental in a battle."

Several etymologies of Iðavöllr (a location in Norse mythology

Norse mythology

Norse mythology, a subset of Germanic mythology, is the overall term for the myths, legends and beliefs about supernatural beings of Norse pagans. It flourished prior to the Christianization of Scandinavia, during the Early Middle Ages, and passed into Nordic folklore, with some aspects surviving...

) have been proposed, and the meaning of the name is considered unclear. If Iðavöllr is amended to *Ið[is]avöllr, the location name corresponds precisely to Idisiaviso.