The All Saints' Flood of 1170 (Allerheiligenvloed) was a catastrophic flood in the

Netherlands ) , anthem = ( en, "William of Nassau") , image_map = , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of the Netherlands , established_title = Before independence , established_date = Spanish Netherl ...

that took place in 1170. Large parts of the Northern Netherlands, and

Holland Holland is a geographical regionG. Geerts & H. Heestermans, 1981, ''Groot Woordenboek der Nederlandse Taal. Deel I'', Van Dale Lexicografie, Utrecht, p 1105 and former province on the western coast of the Netherlands. From the 10th to the 16th c ...

territories were overflowed. The flooding

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

created the islands of

Wieringen Wieringen () is part of the municipality of Hollands Kroon, established in 2012 in the province of North Holland in the Netherlands. It is a former municipality in this province, with its name appearing in records of the late 9th and early 10th ...

and

Texel Texel (; Texels dialect: ) is a municipality and an island with a population of 13,643 in North Holland, Netherlands. It is the largest and most populated island of the West Frisian Islands in the Wadden Sea. The island is situated north of De ...

Lake Flevo Lake Flevo was a lake in what is now the Netherlands, which existed in Roman times and the early Middle Ages. Some geographers believe that this lake was not really a single lake, rather a set of several lakes connected to each other. From the ...

was once a fresh water lake, but . The Creiler Woods vanished under the waves. The sea area increased inside the Netherlands and large

peat Peat (), also known as turf (), is an accumulation of partially decayed vegetation or organic matter. It is unique to natural areas called peatlands, bogs, mires, moors, or muskegs. The peatland ecosystem covers and is the most efficien ...

areas developed, which were easily washed away. The flood rendered the settlement of Rotta (the predecessor of

Rotterdam Rotterdam ( , , , lit. ''The Dam on the River Rotte'') is the second largest city and municipality in the Netherlands. It is in the province of South Holland, part of the North Sea mouth of the Rhine–Meuse–Scheldt delta, via the ''"N ...

) uninhabitable, and marked the beginning of

Amsterdam Amsterdam ( , , , lit. ''The Dam on the River Amstel'') is the Capital of the Netherlands, capital and Municipalities of the Netherlands, most populous city of the Netherlands, with The Hague being the seat of government. It has a population ...

, where the area gained an open connection to the sea, and where a dam was built in the

Amstel The Amstel () is a river in the province of North Holland in the Netherlands. It flows from the Aarkanaal and Drecht in Nieuwveen northwards, passing Uithoorn, Amstelveen, and Ouderkerk aan de Amstel, to the IJ in Amsterdam. Annually, the riv ...

to protect the land from future floods.

References

Rome's Greatest Defeat, A Review - All Saints' Flood of 1170
File retrieved March 11, 2007. *Buisman, Jan, ''Duizend jaar weer, wind en water in de Lage Landen (Deel 1: tot 1300)'', Floods in the Netherlands 12th-century floods 12th century in the Netherlands Medieval weather events Texel Norderney {{flood-stub

See also

References