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In page Julie Bondeli:

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She never married, but in 1752 began hosting a scientific salon in Bern which would become, a decade later, a centre of the city's cultural life. Luminaries with whom she enjoyed relationships included Johann Georg Zimmermann, Christoph Martin Wieland and Jean-Jacques Rousseau. Bondeli and Christoph Martin Wieland was engaged for a time, but never wed. Bondeli was also a correspondent of Jean-Jacques Rousseau from 1762 forward, as well as with Johann Georg Zimmermann, Sophie von La Roche, and Johann Kaspar Lavater.[citation needed]