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The Hajnal line is a border that links Saint Petersburg, Russia and Trieste, Italy. In 1965, John Hajnal discovered it divides Europe into two areas characterized by a different levels of nuptiality. To the west of the line, marriage rates and thus fertility were comparatively low and a significant minority of women married late or remained single; to the east of the line and in the Mediterranean and select pockets of Northwestern Europe, early marriage was the norm and high fertility was countered by high mortality.
West of this line, the average age of marriage for women was 23 or more, men 26, spouses were relatively close in age, a substantial number of women married for the first time in their thirties and forties, and 10% to 20% of adults never married. East of the line, the mean age of both sexes at marriage was earlier, spousal age disparity was greater and marriage more nearly universal. Subsequent research has amply confirmed Hajnal's continental divide, and what has come to be known as the 'Western European marriage pattern', although historical demographers have also noted that there are significant variations within the region; to the west of the line, about half of all women aged 15 to 50 years of age were married while the other half were widows or spinsters; to the east of the line, about seventy percent of women in that age bracket were married while the other thirty percent were widows or nuns. That a number of widows remarried also kept the age of marriage comparatively high; if women married for the first time at twenty-one years of age and twenty percent of all weddings featured a widowed bride and the average age of remarriage was forty years then the average marriage age for women would be 24.8 years: (21 × 0.8) + (40 × 0.2) = 24.8. The proportion of marriages that were remarriages (widows and/or widowers marrying again) in the late 1500s was as high as thirty percent; that proportion had fallen to just over eleven percent in the early 1800s.
The Western European pattern of late and non-universal marriage restricted fertility massively, especially when it was coupled with very low levels of childbirth out of wedlock. Birth control took place by delaying marriage more than suppressing fertility within it. A woman's life-phase from menarche (which was generally reached on average at 12–14 years) to the birth of her first child was unusually long, averaging ten to twelve years.
Class differences played a great role in when a couple could marry; the wealthier that a couple was, the likelier that they were to marry earlier. Noblewomen and gentlewomen married early, but they were a small minority; a thousand marriage certificates issued by the archdiocese of Canterbury between 1619 and 1660 show that only one bride was aged thirteen years, four were fifteen, twelve were sixteen, seventeen were seventeen, and the other 966 of the brides were aged nineteen years or older when they married for the first time. The church stipulated that both the bride and groom must be at least 21 years of age to marry without the consent of their families; the most common ages of marriage were 22 for women, 24 for men; the median ages were 22.75 for women and 25.5 for men; the average ages were 24 years for women and nearly 28 years for men. The youngest brides were nobility and gentry.
The moderate rates of fertility, mortality, and marriage within the region were tied to the economy; when times were better, more people could afford to marry early and thus have more children and conversely more people delayed marriages (or remained unmarried) and bore fewer children when times were bad. This contrasts with societies outside of this region, where early marriage for both sexes was virtually universal and high fertility was counteracted by high mortality; in the 15th century, a Tuscan woman 21 years of age would be seen as past marriageable age, the deadline for which was 19 years, and easily 97 percent of Florentine women were married by the age of 25 years while 21 years was the typical age of an English bride.
The region's late marriage pattern has received considerable scholarly attention in part because it appears to be unique; it has not been found in any other part of the world prior to the Twentieth Century. The origins of the late marriage system are a matter of conjecture prior to the 16th Century when the demographic evidence from family reconstitution studies makes the prevalence of the pattern clear. Many historians have wondered whether this unique conjugal regime might explain, in part, why capitalism first took root in Northwestern Europe, contributing to the region's relatively low mortality rates, hastening the fragmentation of the peasantry and the precocious formation of a mobile class of landless wage-earners. Others have highlighted the significance of the late marriage pattern for gender relations, for the relative strength of women's position within marriage, the "conjugal" dowry system of Northwestern Europe in which the dowry merged with the husband's wealth and would thus grow or shrink depending on circumstances (perhaps an incentive for many women to work), the centrality of widows in village land inheritance, and the vitality of women's community networks.
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