As a philosopher Porphyry was chiefly important as the immediate successor of Plotinus in the neoplatonic school at Rome, but his "Isagoge" had extraordinary weight among the medieval logicians.
PRISCIAN The _Institutiones grammaticae_ of Priscian (Priscianus Caesariensis) formed the standard grammatical and philological textbook of the Middle Ages, its importance being fairly indicated by the fact that today there exist about a thousand manuscript copies of it.
ANSELM Anselm of Laon was born somewhere about 1040, and is said to have studied under the famous St.Anselm, later archbishop of Canterbury, at the monastery of Bec.

About 1070 he began to teach in Paris, where he was notably successful.

Subsequently he returned to Laon, where his school of theology and exegetics became the most famous one in Europe.

His most important work, an interlinear gloss on the Scriptures, was regarded as authoritative throughout the later Middle Ages.

He died in 1117.