Answer: Ontology
Step-by-step explanation:
Ontology is the branch of metaphysics that studies the nature of being. Book IV of Aristotle´s Metaphysics called it first philosophy. Ontologia was the Latin term coined in Ogdoas Scholastica (1606) by Jacob Lorhard, a German philosopher focused on the science of being and everything that is real.
Later, Christian Wolff, a German rationalist philosopher would popularize it in his Philosophia Prima sive Ontologia (1730).