Read this and answer the question. If the question is unanswerable, say "unanswerable".

The modern term "culture" is based on a term used by the Ancient Roman orator Cicero in his Tusculanae Disputationes, where he wrote of a cultivation of the soul or "cultura animi", using an agricultural metaphor for the development of a philosophical soul, understood teleologically as the highest possible ideal for human development. Samuel Pufendorf took over this metaphor in a modern context, meaning something similar, but no longer assuming that philosophy was man's natural perfection. His use, and that of many writers after him "refers to all the ways in which human beings overcome their original barbarism, and through artifice, become fully human".

Who first introduced the metaphor later used by Cicero?
unanswerable