Synonyms for the phrase "of whence" can be found by dissecting the phrase into separate components. "Of" implies possession or belonging, while "whence" means "from where" or "originating from". Therefore, alternative phrases to convey a similar meaning include "belonging to the origin", "originating from" or "coming from the source". These expressions highlight the idea of something belonging or originating specifically from a particular place or point of origin. It is crucial to choose the appropriate synonym depending on the context to ensure clarity and accurate communication.