the world > existence and causation > causation > source or origin > [noun] > person as source of something (3)
figurative and in extended use. A person regarded as a source or abundant manifestation of some quality or virtue. Now rare.
A person or personification regarded as a source, beginning, or origin. Chiefly with of. Now somewhat rare.
A person or agent who introduces the germ of some future idea, practice, or development.