III.

_Apostolorum passio_, _Conditor alme siderum_, _Consors paterni luminis_, _Hic est dies verus Dei_, _Jam lucis orto sidere_, _Nunc sancte nobis Spiritus_, _O lux beata Trinitas_, _Obduxere polum nubila coeli_, _O rex aeterne domine_, _Rector potens, verax Deus_, _Rerum Deus tenax vigor_, _Somno refectis artubus_, _Squalent arva soli pulvere multo_, _Summae Deus clementiae_, _Tristes erant apostoli_.

These have, for one reason or another, been assigned to Ambrose. It is to be remembered that the _Tristes erant_ is a part of the _Aurora lucis rutilat_, and that in many cases the hymns are very much intermingled. A rigid designation is therefore impossible. The fourth class comprehends what may be called _Ambrosiani_—the Sedulian and Gregorian and other hymns being simply excluded from the list.