What Year Does Dune Take Place? 10191 AG, Explained

Dune takes place from 10191 AG to 10193 AG. The novel opens in 10191, when House Atreides leaves Caladan to take over Arrakis, and ends in 10193 with the Battle of Arrakeen and Paul Atreides taking the throne. (Dune and Dune (appendix))

AG stands for After Guild. The years don't count from anything on Earth. They count from the founding of the Spacing Guild, so the honest answer to "what year is that for us?" is that Frank Herbert never tells you. The rest of the series is laid out on the full Dune timeline. This page sticks to the calendar itself.

What does AG mean in Dune?#

AG is After Guild and BG is Before Guild. The Imperial calendar, also called the Universal Standard Calendar, takes as its first year the moment the Spacing Guild locked down its hold over space travel, shipping and Imperial banking. The Dune Wiki's explanation for picking that moment is practical: once the Guild controlled the ships, travel and finance became uniform, and it put limits on where rivals could fight and when. That restriction is the Guild Peace. (Dune (appendix) and per the Dune Wiki entry on the Imperial Calendar)

The Guild's monopoly runs through the ten thousand years of House Corrino and on through the 3,500-year reign of Leto II, until Ixian no-ships replace the Navigators by the time the Honored Matres return. (Dune, God Emperor of Dune, Heretics of Dune and per the Dune Wiki entry on the Spacing Guild)

Which dates in Dune are Frank Herbert's?#

People get tangled here. Herbert gives fewer firm dates than you might expect, and most of them come from the appendices and the Terminology of the Imperium printed at the back of Dune.

From Herbert, you get:

• The Butlerian Jihad, from 201 BG to 108 BG, dated in the Terminology. Appendix II calls it "two generations of chaos".
• The 110 centuries of deep space travel that came before the Jihad, from Appendix II.
• The Battle of Corrin in 88 BG, which gave House Corrino its name.
• Birth years for several characters in the appendix, such as Duke Leto in 10140 AG and the Baron in 10110 AG, plus 10196 AG for the formal end of Shaddam IV's reign.
• Inside the novel, Feyd-Rautha is seventeen in 10191, and Paul has spent his first fifteen years on Caladan.

(Dune and Dune (appendix))

The sequels mostly give relative times. Dune Messiah happens twelve years into Paul's reign and never names a year, Heretics of Dune opens about fifteen hundred years after Leto II's death, and so on. Any exact AG year you see for those books has been worked out from those gaps. (Dune Messiah and Heretics of Dune)

Which dates come from the Encyclopedia and the expanded books?#

Most of the dated detail before the Jihad, and a lot of the fine detail around Dune itself.

The Dune Encyclopedia (1984), compiled by Willis E. McNelly with Herbert's foreword, built a full timeline from the first four novels, invented events Herbert never wrote and mapped them onto real Earth history. It poses as a book written inside the setting, published in 15540 AG. Herbert's foreword approves of it but keeps his own views on questions still open, and the Dune Wiki treats its contents as non-canon. Its Jihad starts in 200 BG under Jehanne Butler rather than Herbert's 201. (The Dune Encyclopedia and per the Dune Wiki entries on The Dune Encyclopedia and its timeline)

The Brian Herbert and Kevin J. Anderson novels fill in the Jihad and the decades before Dune. The Legends of Dune trilogy turns the Jihad into a ninety-three-year war against the evermind Omnius, which matches Herbert's 201 to 108 BG span. The Prelude books add dates Herbert never gave, and sometimes contradict him. (Dune: The Butlerian Jihad, Dune: House Atreides and Dune: House Corrino)

What year is 10191 AG in our calendar?#

No official answer exists. There are two popular ways to fake one.

The Dune Wiki works it out from Herbert's own numbers. Take the 110 centuries of space travel before the Jihad, add the 201 years from the Jihad's start to 1 AG, add 10,191, and you get 21,392 years since deep space travel began. Count from Pioneer 5, launched in 1960, and 10191 AG lands in 23,352 AD. The same page then points out the catch: Heretics of Dune says a Standard Year runs about twenty hours shorter than the old "primitive" year, and nobody knows when the switch happened, so the figure could be out by around four hundred years. It also assumes Herbert meant deep space travel to start in the twentieth century. (Dune (appendix), Heretics of Dune and per the Dune Wiki entry on the Imperial Calendar)

The Encyclopedia gives you a second route, if you accept its non-canon timeline. It puts that Second World War stand-in at 14255 BG, so by my arithmetic 10191 AG sits roughly 24,400 years after it. (The Dune Encyclopedia and per the Dune Wiki entry on its timeline)

So the "Dune is set twenty thousand years in the future" line you'll often see, including in the Dune Wiki's summary of the novel, is a round number that fits the wiki's sum. It isn't a date Herbert wrote down. (per the Dune Wiki entry on Dune)

My read: the conversion is a fun maths puzzle and nothing more. The anchor that matters in the books is relative. Roughly ten millennia separate the fall of the thinking machines from Paul, and the Imperium has been frozen in roughly the same shape ever since. That's the distance Herbert wanted you to feel.

Do the films use the same year?#

Mostly. David Lynch's 1984 film keeps the number but swaps the calendar, calling it 10,191 AD. The 2000 Dune and 2003 Children of Dune miniseries give no dates at all. Denis Villeneuve's films and Dune: Prophecy follow the After Guild dating, though the Dune Wiki notes the films haven't labelled it as such on screen. (Dune (1984 film) and per the Dune Wiki entry on the Imperial Calendar)

If you're working out what to read around those dates, the Dune books in order sets each novel against its AG years, and the twelve years between Dune and Messiah covers the first gap Herbert left undated.