Beatus vir in the context of "Psalter"

In a written or published work, an initial is a letter at the beginning of a word, a chapter, or a paragraph that is larger than the rest of the text. The word is derived from Latin: initiālis, which means of the beginning. An initial is often several lines in height, and, in older books or manuscripts, may take the form of an inhabited or historiated initial. There are certain important initials, such as the Beatus initial, or B, of Beatus vir... at the opening of Psalm 1 at the start of a Vulgate (Bible). These specific initials in an illuminated manuscript were also called initia (sg.: initium).
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The Stuttgart Psalter (Württembergische Landesbibliothek Stuttgart, Bibl. fol. 23) is a richly illuminated 9th-century psalter, considered one of the most significant of the Carolingian period. Written in Carolingian minuscule, it contains 316 images illustrating the Book of Psalms according to the Gallican Rite. It has been archived since the late 18th century at the Württembergische Landesbibliothek in Stuttgart.