Ilanz (Romansh: Glion) is a former municipality in the district of Surselva in the Swiss canton of the Grisons.

Johannes von Ilanz, the Abbot of Disentis, was among the three nobles instrumental in creating this "eternal alliance."

In the 1520s, the Diet of Ilanz declared that citizens of the Three Leagues should be free to choose between Catholicism and the Protestant forms of Christianity then rising to the fore.

[citation needed] These and other events resulted in a counter-reformation within the Swiss Confederation that reversed many of the gains of the Reformation in Switzerland.

Of the rest of the land, 18.7% is settled (buildings or roads) and the remainder (5.7%) is non-productive (rivers, glaciers or mountains).

It is also the nearest major town to the Weisse Arena ski resort situated just further up the valley.

The neighbouring villages of Ruschein and Ladir are accessed from Ilanz, as well as Vrin, Vals, and Obersaxen.

The wettest month is August, during which time Ilanz receives an average of 102 mm (4.0 in) of precipitation.

A Carolingian hoard of two ornately decorated salt containers and coins was discovered near the ruins of the castle in 1811.

Fluent in both German and Romansch, he was deeply interested in multiculturalism and authored several books, including the nationally acclaimed, Crisis in Swiss Pluralism, published in 1979.

He was of German and Swiss origin with his maternal ancestry tracing back to Strada (now part of Ilanz/Glion).