Dante's Divine Comedy: the structure of the journey, summarized

A man writing far from home

Dante Alighieri was born in Florence between May and June 1265. By 1300 he was a prominent citizen: from 15 June to 15 August that year he sat among the priors, the highest governing office in the city. They were hard months. Florence was split between two Guelph factions, the Whites and the Blacks, and during that term the leaders of both were banished.

Two years later it was his turn. On 17 January 1302, while he was outside the city, a first sentence hit him with a fine, banishment and exclusion from public office; on 10 March the penalty became perpetual exile, under threat of death if he fell into the commune’s hands. From then on he lived as a guest, moving from one court to another, and he never saw Florence again. He died in Ravenna during the night of 13-14 September 1321.

The Comedy belongs to those homeless years. Earlier he had published the Vita nuova, around 1292-93, then worked on the Convivio and De vulgari eloquentia between roughly 1304 and 1307. The poem came afterwards and grew across the whole span of the exile, from around 1307-1308 on: Inferno was already circulating before April 1314, Purgatorio soon after, and Paradiso was begun around 1316.

One hundred cantos held together by a chain of rhymes

The Comedy runs on a system of numbers, and those numbers are the first thing to get straight. There are three canticles: Inferno, Purgatorio, Paradiso. Each contains 33 cantos. That would come to 99, but Inferno has one extra at the front, a prologue to the entire poem — which makes one hundred cantos exactly. The line count is 14,233, all hendecasyllables, lines of eleven syllables.

The verse form is terza rima, and Dante was the first poet to use it. The text runs in tercets, groups of three lines, with a scheme that hooks into itself: ABA, BCB, CDC, and onwards. The middle line of every tercet sets the rhyme for the one that follows, like a link closing into the next.

Practical example: take the opening lines of the Inferno. “Nel mezzo del cammin di nostra vita” (A), “mi ritrovai per una selva oscura” (B), “ché la diritta via era smarrita” (A) — vita and smarrita rhyme, oscura hangs loose in the middle. The next tercet picks that loose rhyme up and builds on it: dura, forte, paura, leaving its own middle rhyme hanging in turn. No tercet stands alone: a scribe copying by hand cannot drop a line without the chain of rhymes giving it away.

Canticle	Cantos	Setting	Dante’s guide
Inferno	34	Nine circles cut into the Earth	Virgil
Purgatorio	33	A mountain with nine zones of ascent	Virgil, then Beatrice at the summit
Paradiso	33	Nine concentric heavens, then the Empyrean	Beatrice, then St Bernard

Seven days, three guides

The journey is set in the spring of 1300, when Dante is in his thirty-fifth year: the exact midpoint of a life, if you accept the biblical span of seventy years. It begins on the evening of Good Friday and lasts seven days. The precise date is still argued over, because the reckonings behind the two candidates differ. Treccani places the journey between 8 and 14 April 1300, while Dantedì — the national day established by Italy’s Council of Ministers in 2020, proposed by the then culture minister Dario Franceschini — falls on 25 March.

There are three guides, and they follow one another. Virgil, the Roman poet of the Aeneid, takes Dante through Hell and up Mount Purgatory to the summit. There Beatrice arrives — in the author’s own life most likely Bice di Folco Portinari, married to Simone de’ Bardi and dead on 8 June 1290 — and carries him through the heavens. For the final stretch, in the Empyrean, St Bernard steps in.

Hell: nine circles in a strict order

Dante’s Hell is an inverted funnel inside the body of the Earth, divided into nine concentric circles that narrow as they go down. The deeper the circle, the graver the sin and the harsher the punishment. It is a medieval geography, imagined centuries before anyone knew anything solid about the planet’s interior; for the real picture, see the recap on volcanoes and earthquakes.

The ordering of sins is deliberate, and it is the part exams ask about most. In canto XI Virgil stops to explain it, citing Aristotle’s Ethics: there are three dispositions heaven rejects — incontinence, malice and bestiality. Incontinence, failing to rein in a desire, is the mildest and sits in the upper circles. Malice, which sets out to injure someone, is carried out in two ways: by force, which is violence, or by fraud. That is why the violent lie below the incontinent and the fraudulent below the violent: fraud is “de l’uom proprio male”, an evil belonging to humans alone, because it takes intelligence, and for Dante betraying by cunning offends more than striking by force.

Each sin draws a punishment built to echo or invert it — the principle known as contrappasso. None of this came out of nowhere. Picturing an afterlife with a precise map and a judge weighing souls is very old; long before the Christian version, ancient Egypt put Osiris in charge of judging the dead.

Purgatory: the effort of climbing

Hell is descended; Purgatory is climbed. It is a mountain divided into nine zones: an Ante-Purgatory where souls wait before they may begin, seven terraces, and the Earthly Paradise at the summit. Each terrace is given over to one capital vice, and souls stay until they have finished purging it.

Here too the ordering is explained inside the text. In canto XVII Virgil says that everything, good and bad alike, springs from some form of love: “né creator né creatura mai […] fu sanza amore” — neither creator nor creature was ever without love. Vices are misdirected loves, and the terraces are arranged by how badly the love has gone wrong. On the fourth, for instance, souls purge sloth: love that is too lukewarm towards the good.

The difference from Hell is time. In the circles the punishment is final; on the terraces it is a stage, and the souls Dante meets often ask for prayers from the living to shorten the wait.

Paradise: nine heavens and the Empyrean

The last canticle follows the cosmology of Dante’s day, which held the Earth still at the centre of the universe with the celestial spheres turning around it. Dante and Beatrice pass through nine concentric heavens, and beyond the outermost lies the Empyrean, not a physical place but the seat of God and the blessed.

As the ascent goes on, the writing itself changes. Hell has bodies, wounds and mud; Paradise is left with light, music and ideas. It is also the most experimental canticle of the three: Dante says over and over that language cannot hold what he has seen.

Why “comedy” does not mean funny

The title Dante chose was Comedìa. In the Middle Ages “tragedy” and “comedy” classified two things at once: how the story moves — tragedy ends badly, comedy well — and the register, refined in the first, plainer and more everyday in the second. Dante’s poem answers both tests: it starts in a dark wood and ends in the vision of God, and it mixes the lowest subjects and tones with the highest, often inside a single canto.

The adjective “divine” came later, and not from the author. Boccaccio used it first; it became a permanent part of the name when it appeared on the title page of the Venetian edition of 1555, edited by Ludovico Dolce. From that point on, for everyone, the book was the Divine Comedy.

A text that has crossed seven centuries

The Comedy spread quickly, and for that very reason messily. Around 600 manuscripts survive; the oldest among those carrying a date is codex Landiano 190, produced in 1336 and held in Piacenza — barely fifteen years after the author’s death. But scribes were constantly comparing different exemplars and correcting one against another: no copy stayed clean, and working out what Dante actually wrote is a job scholars have not finished.

The poem also left marks on the Italian language, which still carries expressions that came from it. Anyone following Italian literature forward finds the next step six centuries on, with Luigi Pirandello and the theatre of the twentieth century.