North Holland, 1st-10th century St. Lucia's flood (Sint-Luciavloed) was a

storm tide A storm surge, storm flood, tidal surge, or storm tide is a coastal flood or tsunami-like phenomenon of rising water commonly associated with low-pressure weather systems, such as cyclones. It is measured as the rise in water level above the ...

that affected the

Netherlands , Terminology of the Low Countries, informally Holland, is a country in Northwestern Europe, with Caribbean Netherlands, overseas territories in the Caribbean. It is the largest of the four constituent countries of the Kingdom of the Nether ...

and

Northern Germany Northern Germany (, ) is a linguistic, geographic, socio-cultural and historic region in the northern part of Germany which includes the coastal states of Schleswig-Holstein, Mecklenburg-Vorpommern and Lower Saxony and the two city-states Hambur ...

on 13/14 December 1287 ( OS), St. Lucia Day and the day after, killing approximately 50,000 to 80,000 people in one of the largest floods in recorded history. A low-pressure system mixed with a high tide caused the North Sea to rise over the seawalls and dikes, causing a large portion of the Netherlands and Northern Germany to be flooded. This disaster was similar to the

North Sea flood of 1953 The 1953 North Sea flood () was a major flood caused by a heavy storm surge that struck the Netherlands, north-west Belgium, England and Scotland. Most sea defences facing the surge were overwhelmed, resulting in extensive flooding. The ...

, when an intense

European windstorm European windstorms are powerful extratropical cyclones which form as cyclone, cyclonic windstorms associated with areas of low atmospheric pressure. They can occur throughout the year, but are most frequent between October and March, with peak ...

coinciding with a high tide caused a huge storm surge. The St. Lucia flood had a major influence on the subsequent history of the Netherlands. As a result of this event, a vast percentage of the country's population was wiped out.

Creation of Zuiderzee

The name

Zuiderzee The Zuiderzee or Zuider Zee (; old spelling ''Zuyderzee'' or ''Zuyder Zee''), historically called Lake Almere and Lake Flevo, was a shallow bay of the North Sea in the northwest of the Netherlands. It extended about 100 km (60 miles) inla ...

("Southern Sea", from the

Frisia Frisia () is a Cross-border region, cross-border Cultural area, cultural region in Northwestern Europe. Stretching along the Wadden Sea, it encompasses the north of the Netherlands and parts of northwestern Germany. Wider definitions of "Frisia" ...

n perspective) dates from after this event, as the water had before been a

freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include non-salty mi ...

lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from ...

that was only directly connected to the

North Sea The North Sea lies between Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium, and France. A sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Se ...

by the former river

Vlie The Vlie or Vliestroom () is the seaway between the Dutch islands of Vlieland, to its southwest, and Terschelling, to its northeast. The Vlie was the estuary of the river IJssel in medieval times. Today it's still possible to reach the port of ...

. The St. Lucia's flood removed the last of a series of natural sandy

dunes A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex. A large dune complex is called a dune field, while broad, flat ...

and

boulder clay Boulder clay is an unsorted agglomeration of clastic sediment that is unstratified and structureless and contains gravel of various sizes, shapes, and compositions distributed at random in a fine-grained matrix. The fine-grained matrix consists o ...

barriers, after which the new, now salty Zuiderzee came into existence and grew rapidly, since the

peatlands A peatland is a type of wetland whose soils consist of Soil organic matter, organic matter from decaying plants, forming layers of peat. Peatlands arise because of incomplete decomposition of organic matter, usually litter from vegetation, du ...

behind the former barriers were now mostly unprotected against erosion from the sea. The coming into existence of the Zuiderzee was the undoing of the powerful medieval trading city of

Stavoren Stavoren (; ; previously Staveren) is a city in the province of Friesland, Netherlands, on the coast of the IJsselmeer, about 5 km (3.1 mi) south of Hindeloopen, in the municipality of Súdwest-Fryslân. Stavoren had a population of 950 in ...

on the right bank of the now disappearing river Vlie, and the making of first the

IJssel The IJssel (; ) is a Dutch distributary of the river Rhine that flows northward and ultimately discharges into the IJsselmeer (before the 1932 completion of the Afsluitdijk known as the Zuiderzee), a North Sea natural harbour. It more immediatel ...

Hanse The Hanseatic League was a Middle Ages, medieval commercial and defensive network of merchant guilds and market towns in Central Europe, Central and Northern Europe, Northern Europe. Growing from a few Northern Germany, North German towns in the ...

-cities of Kampen,

Zwolle Zwolle () is a List of cities in the Netherlands by province, city and Municipalities of the Netherlands, municipality in the Northeastern Netherlands. It is the Capital city, capital of the Provinces of the Netherlands, province of Overijssel ...

Deventer Deventer (; Sallaans dialect, Sallands: ) is a List of cities in the Netherlands by province, city and Municipalities of the Netherlands, municipality in the Salland historical region of the Provinces of the Netherlands, province of Overijssel, ...

Zutphen Zutphen () is a city and municipality located in the province of Gelderland, Netherlands. It lies some northeast of Arnhem, on the eastern bank of the river IJssel at the point where it is joined by the Berkel. First mentioned in the 11th centur ...

, and

Doesburg Doesburg () is a municipality and a city in the eastern Netherlands in the province of Gelderland. Doesburg received city rights in 1237 and had a population of in . The city is situated on the right bank of the River IJssel at its confluence w ...

, and later the anti-Hanseatic city of

Amsterdam Amsterdam ( , ; ; ) is the capital of the Netherlands, capital and Municipalities of the Netherlands, largest city of the Kingdom of the Netherlands. It has a population of 933,680 in June 2024 within the city proper, 1,457,018 in the City Re ...

, which began its rise from nothing almost immediately after the St. Lucia's flood.

Netherlands (West-Frisia and Frisia proper)

Much land was permanently flooded in what is now the Waddenzee and

IJsselmeer The IJsselmeer (; , ), also known as Lake IJssel in English, is a closed-off freshwater lake in the central Netherlands bordering the Provinces of the Netherlands, provinces of Flevoland, North Holland and Friesland. It covers an area of with a ...

. It especially affected the north and northwestern part of the Netherlands, particularly the current provinces of

North Holland North Holland (, ) is a Provinces of the Netherlands, province of the Netherlands in the northwestern part of the country. It is located on the North Sea, north of South Holland and Utrecht (province), Utrecht, and west of Friesland and Flevola ...

and

Friesland Friesland ( ; ; official ), historically and traditionally known as Frisia (), named after the Frisians, is a Provinces of the Netherlands, province of the Netherlands located in the country's northern part. It is situated west of Groningen (p ...

. The island of Griend in the current Waddenzee saw serious destruction, with only ten houses left standing. After the flood, Harlingen, about 25 kilometres southeast of Griend and formerly landlocked, came into existence as the new

seaport A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Hamburg, Manc ...

of Friesland, a role it kept for seven centuries. The only part of the current northwestern Netherlands, apart from the western

Dune A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex. A large dune complex is called a dune field, while broad, flat ...

s area (the old Dutch heartland) and the

Frisian Islands The Frisian Islands, also known as the Wadden Islands or the Wadden Sea Islands, form an archipelago at the eastern edge of the North Sea in northwestern Europe, stretching from the northwest of the Netherlands through Germany to the west of Denm ...

that escaped annihilation was West-Friesland, since this area was already protected by a ringdike that mostly held and where not, could be repaired after the floods receded. Shortly after the St. Lucia Day disaster, the West-Frisia, now separated from the rest of Friesland by a

strait A strait is a water body connecting two seas or water basins. The surface water is, for the most part, at the same elevation on both sides and flows through the strait in both directions, even though the topography generally constricts the ...

of around 15 kilometres at its narrowest, was annexed by the

county of Holland The County of Holland was a Imperial State, state of the Holy Roman Empire from its inception until 1433. From 1433 onward it was part of the Burgundian Netherlands, from 1482 part of the Habsburg Netherlands and from 1581 onward the leading pro ...

, expanding this county northwards. The flood also brought the

Friso-Hollandic Wars The Friso-Hollandic Wars, also called Frisian–Hollandic Wars (; ), were a series of short medieval wars (ranging from single battles to entire campaigns) consisting of the attempts made by the counts of Holland to conquer the free Frisian t ...

, which had lasted around 200 years, to an end. Shortly after this annexation, the West-Frisian cities of

Hoorn Hoorn () is a List of cities in the Netherlands by province, city and Municipalities of the Netherlands, municipality in the northwest of the Netherlands, in the Provinces of the Netherlands, province of North Holland. It is the largest town an ...

and

Enkhuizen Enkhuizen () is a municipality and a city in the Netherlands, in the province of North Holland and the region of West-Frisia. History Enkhuizen, like Hoorn and Amsterdam, was one of the harbour-towns of the VOC, from where overseas trade ...

began a rise to prominence that would last until the 17th century.

In Germany (mostly East Frisia)

The

Chronicle A chronicle (, from Greek ''chroniká'', from , ''chrónos'' – "time") is a historical account of events arranged in chronological order, as in a timeline. Typically, equal weight is given for historically important events and local events ...

s speak of 50,000 killed and total destruction. Many villages disappeared forever. In the current district of East-Frisia alone thirty villages disappeared in the North Sea. Also a first stage of the Dollart came into existence. Because of the large loss of land and the relative insecurity of living in the now far more unprotected peatlands, since natural barriers had been removed by the flood, many survivors gave up their ways of living in the fertile peatlands and moved to the

Geest Geest (, , ) is a type of landform, slightly raised above the surrounding countryside, that occurs on the plains of Northern Germany, the Northern Netherlands and Denmark. It is a landscape of sandy and gravelly soils formed as a glacial outw ...

In England

Although not known by the name of St. Lucia, the same storm also had devastating effects on the other side of the North Sea in England. It killed hundreds of people in England, e.g. in the village of Hickling, Norfolk, where 180 died and the water rose a foot above the high altar in the Priory Church. The storm is one of two in 1287 sometimes referred to as a "Great Storm". The other was the South England flood of February 1287. Together with a surge in January 1286, they seem to have prompted the decline of one of England's then leading ports,

Dunwich Dunwich () is a village and civil parish in Suffolk, England. It is in the Suffolk & Essex Coast & Heaths National Landscape around north-east of London, south of Southwold and north of Leiston, on the North Sea coast. In the Anglo-Saxon ...

Suffolk Suffolk ( ) is a ceremonial county in the East of England and East Anglia. It is bordered by Norfolk to the north, the North Sea to the east, Essex to the south, and Cambridgeshire to the west. Ipswich is the largest settlement and the county ...

References

# Gevaar van water, water in gevaar uit 2001 # Buisman, Jan, ''Duizend jaar weer, wind en water in de Lage Landen (Deel 1: tot 1300)'',

Notes