Released in 2001, Adiemus IV: The Eternal Knot is the fourth album by Welsh composer Karl Jenkins as part of the Adiemus project. Inspired by Celtic history and mythology, this album served as the soundtrack to the S4C International documentary The Celts. In additional to rich string orchestrations and vocals borrowing from world musical styles common to Adiemus, Jenkins adds the accompaniment of ethnic instruments such as the Uilleann pipes and Carnyx.

Personnel

*Adiemus Orchestra

*Karl Jenkins – Conductor

*Miriam Stockley – Vocals

*Mary Carewe – Additional Vocals in Choruses

*Pamela Thorby – Recorder

*Caryl Ebenezer – High Soprano

*Davy Spillane – Uilleann Pipes

*Martin Taylor – Acoustic Guitar

*David Farmer – Accordion

*Catrin Finch – Harp

*Jody K Jenkins – Carnyx Effect and Percussion

Alternate versions

The theme from "Salm O 'Dewi Sant'" is derived from "Psalm 27" of Jenkins's Dewi Sant. The theme from "The Dagda" was borrowed from "Lacus Pereverantiae" from Jenkins's earlier work Imagined Oceans. The theme for "Isle of the Mystic Lake" is that of "Palus Nebularum" also from Imagined Oceans. "The Eternal Knot" went on to become the theme for "Benedictus" from Jenkins's mass The Armed Man.

As is often the case with albums in the Adiemus project, releases in different regions may have different cover art. The cover Japanese release of Adieums IV: The Eternal Knot Has gold text and designs, including a dolphin, over a green background whereas other releases have white text over a Celtic knot on a bluish-green background.