"The Anabasis of Alexander" or "The History of the Wars and Conquests of Alexander the Great" is a historical account of the life and conquests of Alexander the Great, written by the Greek historian and philosopher Arrian of Nicomedia in the 2nd century AD. The work is based on the earlier histories of Alexander written by Callisthenes, Ptolemy, and Aristobulus, as well as Arrian's own personal experience as a military commander in the Roman Empire. The work is divided into seven books, each of which covers a particular period of Alexander's life and conquests. The first two books focus on Alexander's early life and his rise to power, including his ascension to the Macedonian throne and his early campaigns against the Greeks and Persians. The third and fourth books cover his conquest of Asia, including his battles against the Persian Empire and his legendary victories at Issus and Gaugamela. The fifth book describes Alexander's journey through Egypt and his conquest of the Persian capital of Babylon, while the sixth book covers his campaign in India and his eventual return to Babylon. The final book is a brief summary of Alexander's life and legacy, including the division of his empire among his generals after his death. Overall, "The Anabasis of Alexander" is an important historical document that provides a detailed and compelling portrait of one of the most remarkable figures in world history.