The history of Hertfordshire includes such a number of events of primary importance that it is somewhat difficult to make a selection of those most fitted to appear in the limited space available.
—Richard Lydekker, author of Hertfordshire, writing in 1909.[1]
Hertfordshire is an English county, founded in the Norse–Saxon wars of the 9th century, and developed through commerce serving London. It is a land-locked county that was several times the seat of Parliament. From origins in brewing and papermaking, through aircraft manufacture, the county has developed a wider range of industry in which pharmaceuticals, financial services and film-making are prominent. Today, with a population slightly over 1 million, Hertfordshire services, industry and commerce dominate the economy, with fewer than 2000 people working in agriculture, forestry and fishing.
Hertfordshire is one of the historic counties of England first recorded in the early 10th century. Its development has been tied with that of London, which lies on its southern border. London is the largest city in Western Europe; it requires an enormous tonnage of supplies each day and Hertfordshire grew wealthy on the proceeds of trade because no less than three of the old Roman roads serving the capital run through it, as do the Grand Union Canal and other watercourses. In the 19th century, rail links sprang up in the county, linking London to the north. Hatfield in Hertfordshire has seen two rail crashes of international importance (in 1870 and 2000).
Though nowadays Hertfordshire tends to be politically conservative, historically it was the site of a number of uprisings against the Crown, particularly in the First Barons' War, the Peasants' Revolt, the Wars of the Roses and the English Civil War. The county has a rich intellectual history, and many writers of major importance, from Geoffrey Chaucer to Beatrix Potter, have connections there. Quite a number of prime ministers were born or grew up in Hertfordshire.
The county contains a curiously large number of abandoned settlements, which K. Rutherford Davis attributes to a mixture of poor harvests on soil hard to farm, and the Black Death which ravaged Hertfordshire starting in 1349.