Arglwydd arwain trwy'r anialwch. W. Williams. [Strength to pass through the Wilderness.'] This was pub. in the 1st ed. of the author's Alleluia, Bristol, 1745, in 5 st. of 61., as follows:—

An anonymous Latin hymn on the Day of Judgment, dating from as early as the seventh century. The earliest historic reference to this text appears in the Venerable Bede's De Metris (c. 672–735). Formatted as an acrostic, the initial letters of alternating verses follow the order of the alphabet.

The scholar John Mason Neale praised the hymn as a rugged and grand Judgment composition, noting that it contains the foundational germ of the later Dies Irae. The Latin text was included in collections by Cassander (1556), Thomasius, Rambach, Daniel, Du Méril, and Trench. Neale translated it into English as "That great day of wrath and terror," published in his Mediaeval Hymns (1851). Mrs. Elizabeth Charles also rendered a translation beginning "Suddenly to all appearing the great day of God shall come" in 1858.