East Asian marriage, across roughly three millennia of Chinese, Korean, Japanese, and Vietnamese practice, was organized around a different question than the Western institution. Where Western marriage history can be told as a long argument over whether marriage is a sacrament, a contract, or a partnership, East Asian marriage history is a long argument over how the conjugal bond serves the patrilineal descent group, the ancestral cult, and the ethical order of the household. The conjugal bond was rarely conceived as the center of meaning; it was a structural component of the jia (Chinese family), the chip (Korean house), the ie (Japanese household), each of which extended across generations of the dead, the living, and the unborn. Marriage was the technology by which a daughter-in-law was incorporated into her husband's lineage to produce sons who would continue the ancestral sacrifices.
The Confucian classical framework, codified in the Book of Rites and elaborated by Han, Tang, and Song commentators, prescribed marriage through "six rites": proposal, name request, divination, betrothal gifts, request for the wedding date, and the wedding itself. The principals were not the bride and groom but the two heads of household. Marriage required parental consent absolutely; the couple's preference was not a recognized category. The principle of patrilocality—the bride moves to the groom's household—was near-universal. The principle of patrilineal descent meant that the bride's children belonged to her husband's lineage, not her natal one. The "three obediences" (to father, husband, son) and the "seven grounds for divorce" (childlessness, lasciviousness, disobedience to in-laws, garrulousness, theft, jealousy, illness) defined a sharply gendered structure. Patricia Ebrey and Susan Mann have shown how this framework, while remarkably stable in its formal architecture, was lived very differently across class, region, and dynasty.
The Tang (618–907) and Song (960–1279) dynasties were periods of major elaboration. The Tang permitted aristocratic women considerable mobility, remarriage, and property rights. The Song saw the rise of Neo-Confucian moralism, the foot-binding practice (initially elite, later widespread), and the intensification of widow chastity ideology. Zhu Xi's Family Rituals (twelfth century) codified domestic ceremonial that would shape elite practice across East Asia for the next seven hundred years. Korean Choson (1392–1910) imported Zhu Xi's framework wholesale and intensified its patrilineal logic: by the seventeenth century, Korean elite marriage had become more strictly Confucian than Chinese practice itself, with elaborate genealogical record-keeping and severe restrictions on widow remarriage.
Concubinage was a structural feature, not an aberration. A wealthy man could legally take secondary wives and concubines, who had defined but inferior status; their sons could inherit if the principal wife produced none, though with rank consequences. The Chinese elite household was thus often polygynous in practice, monogamous in its single recognized principal wife. Courtesan culture, particularly elaborated in the Tang, Song, and Ming, provided a parallel sphere in which educated men encountered intellectually and erotically sophisticated women outside the marriage system. This created a sharp split: the wife was for the lineage and the ancestral cult; the courtesan, when one could afford one, was for qing (feeling) and aesthetic-erotic companionship. The split is structurally analogous to, but not identical with, the European medieval split between wife and courtly beloved.
Japanese marriage history diverges sharply in its medieval period. Aristocratic Heian (794–1185) marriage practice featured uxorilocal or duolocal residence (husbands visited wives at the wives' parental homes), considerable female property rights, and a flexible erotic culture documented in The Tale of Genji. The samurai class that rose with the Kamakura shogunate gradually imposed patrilocal patrilineal patterns more closely resembling Chinese norms. The Tokugawa period (1603–1867) saw the consolidation of the ie household system, with primogeniture, patrilineal succession, and a sharp distinction between the wife (for the household line) and the geisha, courtesan, or concubine (for pleasure). The Meiji Civil Code of 1898 codified the ie system into modern law and exported it, in modified form, into colonial Korea and Taiwan.
The twentieth century overturned almost all of this. The 1950 Marriage Law of the People's Republic of China abolished arranged marriage, concubinage, child betrothal, and the buying and selling of brides; it established free choice, monogamy, gender equality, and divorce on application. South Korea's 1958 Civil Code, revised repeatedly through 1990 and 2005, dismantled the hojuje patriarchal household-head system and equalized inheritance. Japan's postwar 1947 Civil Code, drafted under American occupation influence, abolished the ie system, ended primogeniture, and established conjugal marriage as the legal norm. Within seventy years, East Asian marriage law moved from one of the most patrilineal systems in world history to a formally egalitarian conjugal model resembling Western law.
The cultural transition has not caught up with the legal one, and the result is the contemporary East Asian marriage crisis. Marriage rates have collapsed across South Korea, Japan, Taiwan, and now urban China. Total fertility rates are the lowest in world history: South Korea below 0.8, Japan around 1.2, urban China comparable. The reasons are debated but converge on a structural mismatch: the legacy expectations of the daughter-in-law role, the elder-care burden, and the household-line obligation persist in family practice and labor markets, while women's education, professional aspirations, and exit options have caught up with or surpassed men's. Young women increasingly refuse the bargain. Young men cannot afford the bargain. The collective Law 5 question for East Asia is whether the next institutional revision will reinvent a marriage form that meets contemporary individual lives, or whether the institution will continue contracting as a generation chooses other ways to live. The answer will shape several of the world's largest economies for the rest of the century.