Marriage has a history, which is the first thing the romantic mind resists hearing. Falling in love feels timeless, and the wedding feels like a participation in something ancient and stable. But the institution you are stepping into has changed shape repeatedly over the past five thousand years, and the form most Westerners now take for granted — a freely chosen, love-based, legally egalitarian, monogamous, state-registered bond between two adults — is roughly fifty years old in its current configuration and would have been unrecognizable to most of the humans who ever married.
The deep history begins before writing. Pair bonding probably stabilized in the human lineage as offspring became more dependent for longer; two adults pooling effort raised survival odds. By the time we get written records — Mesopotamian law codes, Egyptian contracts, Hebrew scripture — marriage is already a thick legal institution involving property transfer, family negotiation, public recognition, and the management of children's status. The Code of Hammurabi (c. 1750 BCE) treats marriage as a contract with detailed provisions for dowry, divorce, adultery, and inheritance. There is nothing primitive or romantic here; it reads like a careful legal instrument because that is what it was.
In the classical Mediterranean, marriage diverged into forms we can still partly recognize. Roman marriage was a civil arrangement, not a religious one. It required consent of both parties and their fathers, could be dissolved by either side, and existed in two forms: with manus, where the wife passed into her husband's legal power, and sine manu, where she remained under her father's authority. Roman marriage was practical, contractual, and surprisingly modern in its treatment of consent and divorce. Greek marriage was more restrictive of women's legal personhood but similarly secular.
Christianity transformed this. Over roughly a thousand years, from the late Roman Empire to the High Middle Ages, the Church absorbed marriage from civil and family jurisdiction into ecclesiastical jurisdiction. Duby's work on medieval France shows the long struggle between the aristocratic model — marriage as alliance, divorce as political tool, multiple wives or concubines accepted — and the clerical model — marriage as indissoluble sacrament, monogamy required, consent of both parties essential, divorce nearly impossible. By the Council of Trent in 1563, the Church had won: marriage was a sacrament, required a priest and witnesses, and could not be dissolved.
The Reformation re-secularized marriage in Protestant regions without fully releasing it from religious framing. Luther and Calvin treated marriage as a civil estate blessed by God but governed by the magistrate. England developed a hybrid: Anglican marriage law combined church courts with parliamentary jurisdiction, and Hardwicke's Marriage Act of 1753 required public ceremony in a parish church, ending the long English tradition of valid private marriages.
The next great shift was the rise of companionate marriage, traced by Stone in his work on early modern England. Beginning in the seventeenth century among the English gentry and spreading slowly, the ideal of marriage shifted from patriarchal household and economic partnership to companionship between spouses who liked each other. By the early nineteenth century, the romantic ideal — marry for love, not arrangement — was ascendant among the Western middle classes. Coontz argues this is the hinge of modern marital history: once love became the legitimate basis for marriage, the institution's logic changed. If you marry for love, falling out of love becomes a reason to leave. The seeds of mass divorce were planted in the romantic ideal itself.
The nineteenth century also saw the state move aggressively into marriage. Civil registration spread across Europe and the Americas. Marriage laws codified who could marry whom — racial restrictions in the American South, religious restrictions in many countries, age and consanguinity rules everywhere. Cott shows how the American state used marriage to define citizenship, race, and the boundaries of acceptable family.
The twentieth century reorganized marriage at a pace previous centuries could not have imagined. Women gained legal personhood inside marriage — the doctrine of coverture, which absorbed the wife's legal identity into the husband's, was dismantled piece by piece from the 1850s through the 1970s. No-fault divorce, beginning in California in 1969 and spreading rapidly, ended the requirement that one spouse prove the other had committed a serious wrong. Contraception decoupled sex from reproduction inside marriage. Women's mass entry into paid labor ended the economic complementarity that had been marriage's foundation for millennia. Same-sex marriage, unthinkable in any Western legal system until the 1990s, became legal in dozens of countries within twenty-five years.
Cherlin calls the current Western marriage system deinstitutionalized — the social scripts that once told couples what marriage meant and how to do it have weakened, leaving each couple to invent its own version. Marriage rates are falling, ages at first marriage are rising, cohabitation has expanded to fill much of the space marriage once occupied, and the institution looks fragile in ways that would have shocked any previous generation. Whether this is decline or evolution depends on the lens. The romantic lens sees marriage as a chosen, meaningful, optional commitment; the institutional lens sees a load-bearing structure of social order coming loose. Both readings are partly right. The history is not over.