This philosopher gave the earliest influential account of the problem of universals.
This philosopher's ideas were the basis for the opening sections of Peter of Spain's most famous work. He wrote the most famous ancient tract claiming that Christ was nothing but a great philosopher. He substituted "species" for "definition," in his version of the five predicables. This philosopher created a diagram that iterates a forking of species within a genus, while listing their differentiae. He argued against the the mysticism of his student (*) Iamblichus. This philosopher gave the earliest influential account of the problem of universals. His namesake "tree" appears in a book that, in a translation by Boethius, was read as a primer for the Categories, and thus as the basic logic textbook in medieval universities. For 10 points, name this compiler of the Enneads and author of the Isagoge, a Neoplatonic student of Plotinus.
This philosopher's ideas were the basis for the opening sections of Peter of Spain's most famous work.
Porphyry of Tyre [or Porphyrios; accept Porphyrian tree or Arbor Porphyriana] 