An ancestry of dice.

Senet, the game of passing.

Senet appears in Egyptian tomb paintings as early as 3100 BCE, where pharaohs are shown playing it against unseen opponents. Boards have been pulled from tombs across three thousand years, including Tutankhamun's. A racing game on thirty squares, three rows of ten, decided by tossing four flat sticks instead of dice.

The full rules are lost. We have boards, we have pieces, we have paintings of people playing, but no surviving instruction manual. Reconstructions are educated guesses. The name itself, zenet, means roughly "the game of passing": a journey through the afterlife, played out in miniature.

The Royal Game of Ur.

Sir Leonard Woolley pulled five lavish boards out of the royal cemetery at Ur in the 1920s, made of wood, lapis lazuli, and inlaid shell. They were beautiful and useless: nobody knew how the game was played. The rules had been lost for two thousand years.

Then in the early 1980s, a curator at the British Museum named Irving Finkel translated a clay tablet that had been sitting in the collection since 1880. It had been carved in 177 BCE by a Babylonian scribe named Itti-Marduk-balatu, and it described how to play. A race game for two players, seven pieces each, dice rolls determined by four-sided knucklebones. Land on a rosette and you were safe.

The icosahedron, already.

It sits in the Metropolitan Museum of Art, gallery 138. Twenty triangular faces, each inscribed with a Greek letter doubling as a number. Dated somewhere between the 2nd century BCE and the 4th century CE: late Ptolemaic into Roman Egypt. Made of faience or serpentine, both materials Egyptians used for amulets.

Nobody is entirely sure what it was for. The Met thinks divination: cast the die, look up the corresponding line on an oracle stone in a public square. One unique example from Dakhleh Oasis has the names of Egyptian gods on each face instead of numbers. Casting the die was casting a question to the divine.

The geometry of the modern d20 is not a 1970s invention. The plastic is. The shape is older than the New Testament, the Quran, and the entire history of Christendom.

Chaturanga, the four-armed game.

The Sanskrit name means "four limbs," for the four divisions of an Indian army: infantry, cavalry, elephants, and chariots. Played on an 8×8 grid that was already centuries old. Each piece moved differently. The goal was to capture the opposing king, called the raja.

Chaturanga didn't stay in India. Persian merchants took it west, where it became shatranj. Arab traders carried that into the Mediterranean. By the 15th century, European court culture had renamed every piece: the vizier became the queen, the elephant became the bishop, the chariot became the rook. The same game, four different empires of metaphor pasted on top.

The bones of every modern wargame, miniatures game, and tactical strategy game start here. A board, asymmetric pieces with different rules, an objective to capture. Chaturanga is the proof of concept.

Kriegsspiel, the war game.

Georg von Reisswitz developed it to train army officers. Played on an actual military topographical map at 1:8,000 scale, with wooden blocks for units, rules for movement based on real road speeds, and a third player called der Vertrauter, the trusted referee, who adjudicated combat results using custom dice tables.

The Prussian general staff adopted it formally in 1824. After Prussia humiliated France in 1871, every army in Europe started playing kriegsspiel. They were quietly playing it the entire run-up to World War I, which is partly why World War I was so terrible: they had simulated the war, and they thought they knew how it would go.

For our purposes, the relevant breakthrough is small but enormous: a referee. A neutral third party who knows information the players don't, and who tells them what happens when they take an action. In 1812, that referee adjudicates artillery dispersion. In 1974, that referee describes a dragon.

H. G. Wells, on the parlor floor.

The man who wrote The War of the Worlds and The Time Machine also wrote a 96-page book in 1913 called Little Wars, with the subtitle a game for boys from twelve years of age to one hundred and fifty and for that more intelligent sort of girl who likes boys' games and books. Wells was a pacifist, and he believed the book proved his point: if grown men played at war on the floor with toy soldiers, they would not need to do it for real.

The mechanics were simple. Each player commanded an army of tin soldiers. Movement was measured with a tape measure. Combat was resolved by firing a small spring-loaded toy cannon and counting which figures it knocked over. Wells called this part "fair shooting," and the principle survives: a real-world physical action determines a game outcome.

This is the first time wargaming was published as recreation, not training. By the 1950s, American hobbyists had picked up where Wells left off. Avalon Hill started publishing hex-and-counter wargames in 1958. By the late 1960s, there was a whole subculture of tabletop wargamers in the American Midwest, organizing conventions, swapping rules, modding each other's systems.

Jack Vance and the Dying Earth.

Jack Vance published The Dying Earth in 1950. It's a collection of short stories set in the unimaginably distant future, when our sun has gone red and is about to wink out, and a small remnant of humanity practices magic learned from grimoires they barely understand.

Vance's wizards have a strange limitation. Spells take up space in your mind. Each one is so dense and unnatural that holding it in memory requires hours of preparation. Once you cast it, it's gone, scrubbed from your mind, and you have to study it again from the book. A wizard can hold maybe four or five at any one time. The choice of which to memorize that morning is everything.

This is the magic system in every edition of D&D since 1974. Hobbyists call it Vancian magic, and it has been used in every Final Fantasy, every Magic: The Gathering deck restriction, every video game with a "spell slot" mechanic. Vance was paid for none of it during his lifetime in any meaningful sense.

The parents: Chainmail and Blackmoor.

In 1971, Gary Gygax and Jeff Perren published Chainmail in Lake Geneva, Wisconsin. It was a medieval miniatures wargame, but it included a small fantasy supplement: rules for adding wizards, dragons, and trolls to the battlefield. The supplement was an afterthought. It would prove to be the entire point.

The same year, three hundred miles away in Minneapolis, Dave Arneson was running a wargaming group experimenting with a freeform game called Braunstein, where instead of commanding armies each player controlled a single individual. Arneson grafted Braunstein onto Chainmail's fantasy rules and started running a campaign called Blackmoor: players each had one character, who came back week after week, leveled up, and explored a dungeon under a castle that Arneson described from behind a screen.

Persistent characters. A dungeon. A referee describing the world. That was the leap. Arneson showed it to Gygax in late 1972. They spent a year writing it down together.

Dungeons & Dragons, Three Booklets in a White Box.

Gygax printed it himself in January 1974, after every established game publisher had passed on it. Three thin booklets in a wood-grain-printed white box: Men & Magic, Monsters & Treasure, and The Underworld & Wilderness Adventures. Total page count, about 110.

Everything was in there. Hit points, armor class, character classes, levels, alignment, the d20 to hit, the saving throw, Vancian spell slots, the dungeon master, the campaign that continues across sessions. The synthesis of every ancestor on this list, plus the literary debts to Tolkien, Howard, Leiber, and Vance.

It sold a thousand copies fast, then ten thousand, then a hundred thousand. The 50th anniversary was in 2024. Wizards of the Coast estimates that more people are playing D&D today than at any point in the game's history. The lineage that started in pre-dynastic Egypt is, for the first time in 5,126 years, still accelerating.