Psalm 102 is the 102nd psalm of the Book of Psalms, beginning in English in the King James Version: "Hear my prayer, O LORD, and let my cry come unto thee." In Latin, it is known as "Domine exaudi orationem meam".
Beginning of the psalm in the Ramsey Psalter, with illuminated initial
Stowe Psalter, f.2
Start of Psalm 102, from the Utrecht Psalter, c. 800, Utrecht University Library
Beatus vir are the first words in the Latin Vulgate Bible of both Psalm 1 and Psalm 112. In each case, the words are used to refer to frequent and significant uses of these psalms in art, although the two psalms are prominent in different fields, art in the case of Psalm 1 and music in the case of Psalm 112. In psalter manuscripts, the initial letter B of Beatus is often rendered prominently as a Beatus initial.
Beatus initial, f.4, start of Psalm 1 in the 10th-century Anglo-Saxon Ramsey Psalter
Beatus vir takes up the whole page in the 9th-century Ludwig Psalter.
The Tree of Jesse Beatus initial in the Gorleston Psalter, c. 1310, bordered by the royal arms of England and France (fol. 8r)