Antikrist (English: Antichrist) is the only opera by Danish composer Rued Langgaard. It was composed in 1921–23 and reworked in 1926–30, but despite several attempts by the composer to have it performed, the work was not premiered until many years after Langgaard's death. Today, it is considered Langgaard's principal work and is included in the Danish Culture Canon; it was the first Danish opera recorded on DVD in 2002. Background. The first version of Antikrist was completed in 1923 and submitted to the Royal Danish Theatre that year.
https://en.wikipedia.org/wiki/Antikrist