Casting around for a way to start to convey what Guy Gavriel Kay gets up to in Under Heaven, I found myself thinking of another recent fantasy novel. Jo Walton’s Lifelode (2009) is a rather different kind of book, one that does not attract adjectives like “sumptuous” so readily — it is, for not quite enough of its length, a beautifully low-key rural-domestic fantasy, set in a world in which time moves faster, and life is more wild, the further East you travel. Perhaps partly in response to this flux, and the effect it has on people as they travel, the characters in Walton’s novel have a word to describe someone who is being utterly, characteristically, themselves: truly embodying a quality. No such word exists within the world of Under Heaven, and for a reader looking in from outside the reason seems clear: it is unthinkable that any character in Kay’s novel could act in any way other than to be utterly, characteristically, themselves.

The daunting clarity of Kay’s vision extends beyond the individual. It’s probably well-known by now that Under Heaven tells a story inspired by events that took place in China’s Tang Dynasty — it’s certainly not a secret, since a letter to readers at the start of the Roc ARC sets out to justify this choice. And in fact, I’d argue that any solid understanding of the novel must confront and absorb at least the implications of Kay’s approach. (A deep reading would consider the details of the execution as well, but that’s not something I’m competent to attempt.) Under Heaven’s debt to history is heavier than most epic fantasy seeks, and evident in its choice of setting, story and characters, most of which have real counterparts; even if you don’t accept Kay’s assertion that this is a more moral strategy than straightforward history would be, it’s worth recognising how it shapes the narrative and tone of the novel. Precisely because it is a fantasy novel, and not a historical novel, Kay’s creation can be what you might call a platonic ideal of Tang China: a world of heart-stopping beauty, home to humans capable of astonishing subtlety and cruelty, all described with precision and thoroughness. Or to use Walton’s term, Under Heaven seems raensome.

This affect — magic but little mystery — is familiar from the other Kay novel I’ve read, The Lions of Al-Rassan (1995), and from what I gather it’s an increasingly prominent feature of his work. But it seems particularly useful here, given the particular history being reworked, in defusing the notion of inscrutability. Characters outside the empire of Kitai — Kay’s Tang — are liable to find its citizens as baffling as Western stereotypes assert in our world, complaining of “the breeding and courtesy” that Kitai citizens “donned like a cloak” (29). A courtesan known as Spring Rain, brought to the very heart of Kitai from Western lands, reflects that she could study her masters until she was “bent like an ox-cart wheel” without understanding them, “or how the Celestial Empire dominates the world they know” (148). And Kay’s superlative-rich style risks beauty fatigue; there are more than a few moments when it seems the extravagance of his vision might be better expressed as one of the poems whose cultural importance he so openly admires.

But we readers are led into the minds the outsiders cannot know: so we can appreciate how the elaborate dances of the Kitai Court are designed to both channel and restrain human responses, how they perpetuate themselves and how human passions, like water from a dammed river, may find a new course. It is an article of faith within Kitai that it represents “the most civilized empire the world had ever known” (79). The intertwined superiority and fear that this attitude breeds snake into every character’s heart, surfacing in the superstitious caricaturisation of the world beyond Kitai; or in the tendency to philosophise about changes in “the world”, as though Kitai were the whole of it. The empire is a weight; a lot of characters spend a lot of time being angry under its burden, or exhausted by the attempt to negotiate the elaborate formalities of their society.

Our guide in this, the figure to which the novel most consistently returns, is so far as I can tell one of the characters that Kay creates from whole cloth. Shen Tai is the second son of a dead general; a man of deep passions and firm convictions. When we meet him he is embarked on a ritual mourning whose duration and ambition would be absurd if not rendered within Kay’s stately narrative. He has travelled to the edge of the empire and beyond, to the site of a great battle — a place whose extraordinary beauty is thrown into relief by the numberless bones that litter it — to bury the dead of both sides. As the novel opens, two things happen that will draw Tai back East, to the heart of the Empire. The first is that he escapes an assassination attempt for which there is no clear motive. The second is that a princess of Kitai’s past opponents, ostensibly as a token of her admiration for Tai’s work, gifts him two hundred and fifty quality horses — “Heavenly Horses”, as they are known, bigger and stronger than any Imperial stock — instantly, and unwelcomely, making him a player in the Emperor’s court.

Although the assassination attempt initially provides the more urgent narrative impetus, in the end it’s the existence of the horses that shapes the story told in Under Heaven as much or more than the actions of any individual characters, providing the new angle on the well-known story. It’s an interesting frame; it keeps some of what might be expected to be big set-piece events off-stage, but I think Kay is less interested in capturing those than he is in describing the feel of a moment of historical possibility. What’s significant about the gift of horses is that it positions Tai as someone able “to play a role in the balance of power towards the end of a long reign” (139). Certainly, Tai himself seems crafted to play this role: his connectedness allows him to slide in and out of the levels of society, while his initial innocence enables him to serve as our guide. It is easy to follow him. But more than that, both Kay’s letter-to-reader and the text of the novel are at pains to point out that creating a fantasy of history such as this is inherently an act that creates possibility. That is, the novel does successfully open up a space between what was and what might happen: enable a sense that, in contrast to the fatalism on display from some in the Kitai court, lives can and do fork, and that there can be, for better or worse, other worlds.

At this point I should probably specify that the historical event from which Kay weaves his story, the narrative through which Tai and his horses ghost, is the eighth century An Shi rebellion, in which a powerful governor of humble ancestry attempted to usurp the ruling dynasty, resulting in nearly a decade of strife and the deaths — as much from famine and disease as anything else — of several tens of millions of people. To set this out is not a spoiler, not just because Kay acknowledges the inspiration, but because of that possibility space, which refreshes the seeming inevitability of history.

But the relationship goes deeper. Kay is scrupulous about emphasising that Under Heaven is a story. We are, he writes, pattern-seeking creatures, and this shapes our approach to history: we are liable to abstract it, to simplify it, to use it for our own ends. Put another way, the creation of a possibility space — the creation of story from history — creates meaning. The novelistic attention to coincidence becomes an illustration of such: “Only a patient historian with access to records is likely to discover such links,” Kay writes; only “someone shaping a story for palace or marketplace … would note these conjunctions and judge them worth the telling” (542). And for all that Kitai is no less concrete than a description of the historical Tang would be, for all that the overlap between the two is not nearly small enough for Kitai to be taken as entirely independent — for all that Under Heaven’s raensomeness inescapably makes it a novel “about” Tang China in a way that it is not a novel “about” any specific Tang figures — it is still an abstraction, still a use of history. Under Heaven aims to extract the essence of a time and a place, such that it becomes “universalized in powerful ways”: but it tells you it’s doing it, and argues that if all history is story, there can be no final, specific truth, only degrees and directions of universalization.

Such an argument requires a carefully controlled narrative, and Kay’s control of his narrative is very good indeed; may be the best thing about the book, in fact. He works diligently not just to create but to maintain the spaces he claims, particularly in Under Heaven’s final third, when it is confirmed that the novel is a threnody for a culture at the height of its power choosing to diminish. As the implied narrator becomes a real narrator, and the focus gradually pulls back from the story’s present, we are reminded that this telling is only one among an endless series of interpretations and reinterpretations. It’s a hugely moving and fascinating gambit: never in the novel is the potency of historiography clearer, never the distinction between story and history more important, never the tension between the transparency of Kay’s created characters and the unattainability of the people who really lived more palpable. It is, in many ways, a tremendous achievement.