Dominic J. O’Meara 
Plotinus [PDF ebook] 
An Introduction to the Enneads

This is the ideal introduction to the thought of the third-century AD writer Plotinus, one of the greatest of ancient philosophers, now enjoying a major revival of interest. Dominic O’Meara has tailored the book carefully to the requirements of students: he writes clearly and authoritatively, assumes no knowledge of Greek or expertise in ancient philosophy, stays close to the texts, and relates Plotinus’s ideas to modern philosophical concerns.