Conversation so far:
What is a librettist?
A librettist is the writer of a libretto, text used in, or intended for, an extended musical work such as an opera, operetta, masque, oratorio, cantata or musical.
What notable piece did Jean-Philippe Rameau create ?
Rameau produced his most important comic opera, Platée in 1745.
When did Jean-Philippe Rameau create it ?
Rameau produced his most important comic opera, Platée in 1745.
Did Jean-Philippe Rameau have any other notable pieces besides Platée?
Two collaborations with Voltaire: Le temple de la gloire and La princesse de Navarre, gained Rameau official recognition.

Question: Was he commissioned to create these pieces ?
Self-contained rewrite: Was Jean-Philippe Rameau commissioned to create Platée, Le temple de la gloire and La princesse de Navarre?