Where does “Guelphism” come from?

Guelphism (English) comes from English ism, from English -ism, from Latin -ismus, from Ancient Greek -ισμός, from Ancient Greek -μός, from Proto-Indo-European -mós — Creates action/result nouns from verb stems.

Guelphism (English): The beliefs of the Guelphs medieval Italian faction that supported the Pope against the Ghibellines and the German emperors

Definitions

  1. The beliefs of the Guelphs medieval Italian faction that supported the Pope against the Ghibellines and the German emperors

Ancestry of “Guelphism”, step by step

Guelphism traces back through two separate lines of ancestry.

via English ism

StepLanguageWordMeaning
1EnglishismAn ideology, system of thought, or practice that...
2English-ismUsed to form nouns of action or process or result...
3Latin-ismus-ism
4Ancient Greek-ισμόςForms abstract nouns
5Ancient Greek-μόςForms abstract nouns
6Proto-Indo-European-mósCreates action/result nouns from verb stems

via English Guelph

StepLanguageWordMeaning
1EnglishGuelphA member of a medieval Italian faction that...
2ItalianGuelfoGuelph; Guelphic
3Middle High GermanWelffrom the common noun welf
Every word from Proto-Indo-European -mósEvery word from English -ismEvery word from English ism