North Sea Germanic
Ingvaeonic
Geographic distribution:	Originally the North Sea coast from Friesland to Jutland; today, worldwide
Linguistic classification:	Indo-European Germanic West Germanic North Sea Germanic
Subdivisions:	Anglo-Frisian Low German
The distribution of the primary Germanic languages in Europe in around AD 1:   North Germanic   North Sea Germanic, or Ingvaeonic   Weser-Rhine Germanic, or Istvaeonic   Elbe Germanic or Irminonic   East Germanic

North Sea Germanic, also known as Ingvaeonic /ˌɪŋviːˈɒnɪk/, is a group of West Germanic languages that were first spoken in what is now northern Germany, the Netherlands, and Denmark. They were also spread to the British Isles in the Migration Period. The languages were Old Frisian, Old English and Old Saxon. They have become other languages since then and spread worldwide, especially the modern English language.

Sources

• Bremmer, Rolf H. (2009). An Introduction to Old Frisian. Amsterdam: John Benjamins B.V. ISBN 978-90-272-3255-7.
• Euler, Wolfram (2013). Das Westgermanische - von der Herausbildung im 3. bis zur Aufgliederung im 7. Jahrhundert - Analyse und Rekonstruktion (West Germanic: from its Emergence in the 3rd up until its Dissolution in the 7th Century CE: Analyses and Reconstruction). 244 p., in German with English summary, London/Berlin 2013, ISBN 978-3-9812110-7-8.
• (in German) Maurer, Friedrich (1942) Nordgermanen und Alemannen: Studien zur germanischen und frühdeutschen Sprachgeschichte, Stammes- und Volkskunde, Strasbourg: Hüneburg.
• Ringe, Donald R. and Taylor, Ann (2014). The Development of Old English - A Linguistic History of English, vol. II, 632p. ISBN 978-0199207848. Oxford.
• (in German) Sonderegger, Stefan (1979). Grundzüge deutscher Sprachgeschichte. Diachronie des Sprachsystems. Band I: Einführung – Genealogie – Konstanten. Berlin/New York: Walter de Gruyter. ISBN 3-11-003570-7.
• Voyles, Joseph B. (1992). Early Germanic Grammar: Pre-, Proto-, and Post-Germanic. San Diego: Academic Press. ISBN 0-12-728270-X.