The Germanic umlaut (sometimes called i-umlaut or i-mutation) is a type of linguistic umlaut in which a back vowel changes to the associated front vowel or a front vowel becomes closer to /i/ when the following syllable contains /i/, /iː/, or /j/.. It took place separately in various Germanic languages starting around AD 450 or 500 and affected all of the early languages except Gothic.

The diaeresis (/ d aɪ ˈ ɛr ə s ɪ s,-ˈ ɪər-/ dy-ERR-ə-sis, -⁠ EER-; also known as the trema) and the umlaut (/ ˈ ʊ m l aʊ t /) are two different diacritical marks that (in modern usage) look alike. They both consist of two dots ¨ placed over a letter, usually a vowel; when that letter is an i or a j, the diacritic replaces the tittle: ï. In computer systems, both forms have the ...

La zona occidental y meridional de la actual Alemania se encontraba en manos de las tribus celtas hasta la llegada de los pueblos germánicos a consecuencia de las grandes migraciones, entre las más importantes, la de los teutones y la de los cimbrios entre los años 120 y 116 a. C.. En época de Tácito, hacia el año 100 d. C., los germanos ya se habían asentado a las orillas del …