[Arbor] decora et fulgida ornata regis

<p>This antiphon has the same text as one of the verses of the Hymn <em>Vexilla regis</em>&nbsp;commonly sung during the feasts&nbsp;<a href="http://cantusindex.org/feast/14091400">Exaltatio Crucis</a>,&nbsp;<a href="http://cantusindex.org/feast/14050300">Inventio Crucis</a>, or&nbsp;<a href="http://cantusindex.org/feast/07051000">Dom. de Passione</a>. However, this antiphon has not been found yet in any of the manuscripts indexed in the Cantus Index net of databases.</p>