Answer
The Ambrosian hymns are a collection of sacred hymns in Latin, composed by St. Ambrose of Milan in the fourth century. They are part of the Roman Catholic liturgy and are sung during the liturgy of the hours. There are four hymns that are securely attributed to Ambrose: Aeterne rerum conditor, Deus creator omnium, Iesu dulcis memoria, and Te Deum laudamus.