Rabanus Maurus (ca. 780-856), abbot of Fulda and Archbishop of Mainz, was theological and pedagogical writer. He was born at Mainz about 776 (or possibly 784) and died near there in 856. His name, which is spelled in various ways (Hrabanus, Rabanus, Rhabanus, Reabanus, Raban, Rabano), is connected with Old High German hraban, "raven"; "Magnentius", which sometimes appears before his surname, Maurus, is probably related to his residence in Mainz. At an early age he became a Benedictine monk at Fulda. In 802 he went to Tours to study theology and the liberal arts, under the great scholar Alcuin, from who he received the surname Maurus after the favorite disciple of St. Benedict. After a year of study, he was recalled to Fulda, where he taught at the monastic school and eventually became head-master. In 814 he was ordained as a priest; in 822 he became abbot of the monastery. Under Abbot Hrabanus, the monastery flourished, becoming a renowned seat of learning in the Frankish kingdoms. Between 840 and 847 Hrabanus became embroiled in royal political struggles, resigned as abbot, and fled from Fulda. In 847, after a reconciliation with the king, he was appointed Archbishop of Mainz.
Hrabanus was said to be the most learned man of his age. His knowledge of scripture, patristics, canon law and liturgy was without compare. The scope of his writing extended over the entire field of sacred and profane learning as then understood. He wrote commentaries on nearly all the books of the Old Testament, as well as the Gospel of Matthew and the Pauline Epistles. He also wrote more secular works such as De computo, a treatise on numbers and the calendar; the Excerptio de arte grammatica Prisciani, a treatise on grammar and his famous encyclopedia, De rerum naturis.
De rerum naturis (On the Nature of Things), also known as De universo, is an encyclopedia in 22 books, covering a large range of subjects. It was written between 842 and 847. Hrabanus' stated intent was to compile an encyclopedic handbook for preachers. He drew on earlier sources for his information, particularly the Etymologiae of Isidore of Seville, but the organization of the material was his own invention.
Book 8 is on animals. It is divided into seven chapters: De bestiis ("beasts", mostly mammals); De minutis animantibus (small animals); De serpentibus (serpents, reptiles); De vermibus ("worms", mostly insects); De piscibus (fish); De avibus (birds); De minutis avibus (small birds). The chapters and the animals in them are (based on Schipper) (this list is preliminary and may not be entirely reliable):
Chapter 1: De bestiis - On beasts
Chapter 2: De minutis animantibus - On small animals
Chapter 3: De serpentibus - On serpents
Chapter 4: De vermibus - On worms
Chapter 5: De piscibus - On fish
Chapter 6: De avibus - On birds
Chapter 7: De minutis avibus - On small birds
The books and chapters of the De rerum naturis are listed below (based on Schipper).
Other medieval encyclopedias: