Late Latin is the scholarly name for the written Latin of Late Antiquity. The English dictionary definition of Late Latin dates this period from the 3rd to the 6th centuries AD, extending in the Iberian Peninsula of southwestern Europe to the 7th century. This somewhat ambiguously defined period fits between Classical Latin and Medieval Latin. Although there is no scholarly consensus about exactly when Classical Latin should end, nor exactly when Medieval Latin should begin, Late Latin is characterized (with variations and disputes) by an identifiable style.
Being a written language, Late Latin is not identifiable with Vulgar Latin. The latter during those centuries served as proto-Romance, a reconstructed ancestor of the Romance languages. Although Late Latin reflects an upsurge of the use of Vulgar Latin vocabulary and constructs, it remains to a large extent classical in overall features, depending on the author. Some are more literary and classical, some more inclined to the vernacular. Nor is Late Latin identical to Christian or patristic Latin, the theological writings of the early Christian fathers. While Christian writings are considered a subset of Late Latin, pagans wrote much Late Latin, especially in the early part of the period.
Oh little town of Bethlehem
How still we see thee lie
Above thy deep and dreamless sleep
The silent stars go by
Yet in thy dark streets shineth
The everlasting life
The hopes and fears of all the years
Are met in thee tonight
How silently, how silently
The wond'rous gift is giv'n
So God imparts to human hearts
The blessings of His heav'n
We hear the Christmas angels
the great glad tidings tell
Oh, come to us, abide with us
Our Lord Emmanuel
No ear may hear his coming
But in this world of sin
Where meek souls will recieve him still