Originally published in 1940, this book by famous Plotinus scholar Arthur Hilary Armstrong assesses how the philosopher's hierarchy of reality fits into the wider universal order, and how the historical and philosophical tradition gave rise to Plotinus' own philosophies. Armstrong also supplies a bibliography broken down by topic for those who wish to pursue any aspect of the text in greater depth. This book will be of value to anyone with an interest in Plotinus, Neoplatonism and in the pagan roots of Christian philosophy.