(Ambrosiani) Hymns of the metric and strophic cast peculiar to the authenticated hymns of Saint Ambrose and of his hymnodic school; by extension, a poetical form or a liturgical use. Under the Rule of Saint Benedict, hymns to be used during the canonical hours were styled Ambrosianos. The four hymns universally acknowledged as authentic are: "AEternae rerum Conditor," "Deus Creator Omnium," "Jam resurgit hora tertia," "Veni Redemptor gentium."