fons et origo
noun
fons et ori·go
ˌfōn(t)ˌsetəˈrē(ˌ)gō
: source and origin
western Europe, which … is always dimly assumed as the fons et origo of all social forces—Donald Davidson
: original cause
that this survival of the family god was the fons et origo of Hebrew monolatry—Times Literary Supplement
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Merriam-Webster unabridged
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