Assertion: important poem | /r/ObjectUse | used in the vexilla regis
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Source sentences:
text: The hymnodist Venantius Fortunatus wrote a number of important poems that are still used in the liturgy of the Roman Catholic Church, such as the Vexilla Regis ("The Royal Standard") and Pange, lingua, gloriosi proelium certaminis ("Sing, O my tongue, of the glorious struggle").