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The Library

Forty Centuries of Christian Writing

1277 works catalogued century by century, from the literature the Bible was written among to the present — each with a note on what it is, why it lasted, and where to read it.

1101–1200

The Twelfth Century

98 works

c. 1143–1146

Latin

The Two Cities

Chronica sive Historia de Duabus Civitatibus

Otto of Freising · c. 1114–1158

A world history on Augustine's plan by a bishop who was also an emperor's uncle, written in a mood of deep pessimism about the age.

Western · History

c. 1148

Greek

The Alexiad

Anna Komnene · 1083–1153

A daughter's history of her father's reign, including the arrival of the First Crusade described as an unwelcome flood of armed and unpredictable Latins.

Byzantine · History

1149

Latin

The Dialogues

Anselm of Havelberg · c. 1100–1158

A record of debates held in Constantinople with a Greek archbishop on the filioque and papal authority, prefaced by an argument that the church legitimately changes over time.

Western · Dialogue

c. 1147–1155

Old Church Slavonic

The Epistle to Thomas

Kliment Smoliatich · 12th century

A metropolitan of Kyiv defends himself against the charge of vanity for citing Homer, Plato, and Aristotle, and argues for allegorical reading of scripture.

Rus · Letter

c. 1148–1153

Latin

On Consideration

De Consideratione

Bernard of Clairvaux · 1090–1153

Advice to a former monk now pope: the litigation will swallow you, you are not the successor of Constantine, and you must keep time for yourself or lose your soul.

Cistercian · Advice

c. 1150–1173

Latin

The Ladder of Monks

Scala Claustralium

Guigo II · d. 1188

Four rungs — reading, meditation, prayer, contemplation — described with a domestic image: reading puts food in the mouth, meditation chews it, prayer finds the flavour.

Western Monastic · Devotional

c. 1151

Latin

The Play of the Virtues

Ordo Virtutum

Hildegard of Bingen · 1098–1179

A sung drama in which a soul is pulled between sixteen Virtues, who sing, and the Devil, who can only shout because he has no music.

Western Monastic · Drama

1141–1151

Latin

Scivias

Hildegard of Bingen · 1098–1179

Twenty-six visions of creation, redemption, and the church, each described and then explained by a voice from heaven, and illustrated under her direction.

Western Monastic · Visions

c. 1152

Armenian

Jesus the Son

Hisus Ordi

Nerses Shnorhali · 1102–1173

Some eight thousand lines running from creation to the last judgement, written in a single rhyme and intended to teach the whole faith in verse.

Armenian · Poetry

1135–1153

Latin

Sermons on the Song of Songs

Sermones super Cantica Canticorum

Bernard of Clairvaux · 1090–1153

Eighty-six sermons that never get past the second chapter, reading the Song as the soul's courtship by the Word and building from it a full account of humility, desire, and the degrees of love.

Cistercian · SermonsSong of Songs

c. 1150–1158

Latin

The Four Books of Sentences

Sententiae in IV Libris Distinctae

Peter Lombard · c. 1096–1160

Doctrine arranged in four books — the Trinity, creation, the incarnation, the sacraments and last things — with the authorities marshalled under each question and a cautious verdict given.

Scholastic · Systematic theology

c. 1140–1160

Latin

The Life of Christina of Markyate

Anonymous

A young Englishwoman refuses the marriage her parents arranged, escapes disguised as a man, and lives hidden in a tiny cell for years before founding her own community.

Western · Biography

c. 1150–1158

Latin

The Natural History

Physica

Hildegard of Bingen · 1098–1179

Nine books on plants, elements, trees, stones, fish, birds, animals, and metals, giving the properties and medicinal uses of each.

Western Monastic · Natural science

c. 1155–1156

Latin

Against the Sect of the Saracens

Peter the Venerable · c. 1092–1156

A refutation of Islam addressed, unusually, to Muslims themselves, arguing that they should be approached with reasons rather than arms.

Western Monastic · Polemic

c. 1150–1160

Latin

Causes and Cures

Causae et Curae

Hildegard of Bingen · 1098–1179

A medical handbook on the humours, digestion, sleep, conception, and remedies, including frank descriptions of sexual physiology from a woman's viewpoint.

Western Monastic · Medicine

c. 1150–1170

Latin

Symphony of the Harmony of Celestial Revelations

Symphonia

Hildegard of Bingen · 1098–1179

Seventy-seven liturgical songs with soaring melodies of her own composition, in a Latin full of invented images — greenness, viridity, the fiery breath of the Spirit.

Western Monastic · Hymns

1159

Latin

Metalogicon

John of Salisbury · c. 1120–1180

A defence of the study of logic and grammar against those who want students hurried to profitable subjects, with vivid recollections of the masters he studied under in Paris.

Scholastic · Education

1159

Latin

Policraticus

John of Salisbury · c. 1120–1180

On the follies of courtiers and the duties of rulers, comparing the commonwealth to a body and arguing that a tyrant may lawfully be killed.

Scholastic · Political theory

c. 1150–1165

Greek

Refutation of Proclus

Nicholas of Methone · d. c. 1165

A point-by-point answer to the Elements of Theology, defending creation from nothing against a Neoplatonist system of eternal emanation.

Byzantine · Philosophy

c. 1160–1165

Latin

Spiritual Friendship

De Spiritali Amicitia

Aelred of Rievaulx · 1110–1167

A dialogue rewriting Cicero on friendship for the cloister, arguing that a friend is the guardian of love, and that God is friendship.

Cistercian · Dialogue

c. 1153–1162

Latin

The Mystical Ark

Benjamin Major

Richard of Saint Victor · d. 1173

The ark of the covenant read as a diagram of contemplation, with six kinds of contemplative seeing rising from the senses to what exceeds reason.

Victorine · MysticalExodus

c. 1152–1164

Latin

The Visions

Elisabeth of Schönau · c. 1129–1164

Visions received in ecstasy and dictated to her brother, including revelations about the company of Saint Ursula that helped authenticate a vast relic discovery at Cologne.

Western Monastic · Visions

c. 1160–1162

Latin

A Rule of Life for a Recluse

Aelred of Rievaulx · 1110–1167

Written for his sister, enclosed as an anchoress: practical advice on visitors and servants, then a long meditation on entering the gospel scenes in imagination.

Cistercian · Rule

1158–1163

Latin

The Book of Life's Merits

Liber Vitae Meritorum

Hildegard of Bingen · 1098–1179

Thirty-five vices appear and speak in their own defence, each answered by the corresponding virtue, followed by a description of the punishments awaiting each.

Western Monastic · Visions

c. 1157–1164

Latin

Summa on the Decretum

Rufinus of Bologna · 12th century

The first full commentary on Gratian, defining natural law and working out where custom, papal decree, and conscience each hold.

Western · Canon law

c. 1146–1179

Latin

The Letters

Hildegard of Bingen · 1098–1179

Nearly four hundred letters to popes, emperors, abbots, and ordinary people, rebuking Frederick Barbarossa and defending her nuns' right to bury an excommunicate.

Western Monastic · Letters

c. 1147–1169

Latin

The Sermons

Isaac of Stella · c. 1100–c. 1178

Sermons of unusual philosophical seriousness on the soul, the church as the body of Christ, and the mercy owed to sinners by a community that shares their nature.

Cistercian · Homilies

c. 1160–1170

Latin

Summa on the Decretum

Stephen of Tournai · 1128–1203

A lucid commentary on Gratian written for French students, later followed by a bitter letter complaining that theology students now argue about the Trinity in the street.

Western · Canon law

c. 1160–1180

Greek

The Chronicle

Michael Glykas · 12th century

A world chronicle whose opening section on creation is packed with natural history, and whose author also wrote a prison poem in the vernacular.

Byzantine · Chronicle

c. 1150–1171

Syriac

The Biblical Commentaries

Dionysius bar Salibi · d. 1171

Commentaries on the whole Bible giving both the literal and the spiritual sense, alongside treatises against Muslims, Jews, Armenians, and Chalcedonians.

Miaphysite · Commentary

1163–1170

Latin

The Correspondence

Thomas Becket and his circle · c. 1120–1170

Hundreds of letters from the six-year quarrel over whether clergy accused of crimes could be tried in royal courts, preserved by both sides.

Western · Letters

c. 1162–1173

Latin

On the Trinity

Richard of Saint Victor · d. 1173

An argument for the Trinity from the nature of love itself: perfect charity cannot be solitary, and requires not only a beloved but a third with whom love is shared.

Victorine · Theology

c. 1169–1173

Latin

The Scholastic History

Historia Scholastica

Peter Comestor · d. c. 1178

The narrative books of the Bible retold as continuous history, with pagan history synchronised alongside and difficulties explained as they arise.

Scholastic · History

1163–1174

Latin

The Book of Divine Works

Liber Divinorum Operum

Hildegard of Bingen · 1098–1179

Ten visions on the cosmos and the human body as mirrors of each other, opening with a figure of Love holding the wheel of the world.

Western Monastic · Visions

c. 1173–1175

Latin

The Life of Thomas Becket

William FitzStephen · d. c. 1191

The archbishop's career by a clerk who was present at the murder, prefaced by a famous description of London — its schools, cookshops, and boys skating on bone skates.

Western · Biography

c. 1170–1180

Old French

The Sermons for the People

Maurice de Sully · c. 1120–1196

Short model sermons in French for parish priests to deliver, explaining the gospel of the day in the plainest possible terms.

Western · Homilies

1179

Latin

The Canons of the Third Lateran Council

The Third Lateran Council

Twenty-seven canons requiring a two-thirds majority for papal elections, a free school in every cathedral, and measures against usury, Cathars, and lepers' exclusion from churches.

Western · Canons

c. 1175–1180

Latin

On the Sacrament of the Altar

Baldwin of Forde · c. 1125–1190

A meditative rather than argumentative treatment of the eucharist, reading it through the Old Testament sacrifices and the church's unity in one bread.

Cistercian · Sacramental theology1 CorinthiansHebrews

c. 1170–1195

Greek

Commentaries on the Canons

Theodore Balsamon · c. 1130–after 1195

A commentary on the whole body of church canons, reconciling them with imperial law and ruling on what remained in force.

Byzantine · Canon law

c. 1180

Greek

On the Improvement of Monastic Life

Eustathius of Thessalonica · c. 1115–c. 1195

An attack on monks who sell their monastery's books, keep private property, and despise learning as a distraction from holiness.

Byzantine · Polemic