An excerpt from Altus Prosator, a choral setting by Douglas Buchanan of the 6th century Irish poem of the same name, sometimes attributed to St. Columba. The poem is written in Hiberno-Latin, a form of Latin used by Irish monks in the 6th through 9th centuries. Being so isolated from mainland Europe, the language developed its own words based on independent scholarship and local influence; for example, the word "iduna" is used to mean "hands", which stems from Hebrew rather than Latin ("yadaim").
The poem is also "abecedarian" - each stanza begins with a different letter, making 23 total stanzas (Latin has no J, initial U, or W). The choral work accordingly has a movement for each stanza; the above is Movement "Z", "Zelus ignis furibundus":