The Peloponnesian War, as the great historian Thucydides wrote in the introduction to his eponymous book, which has become one of the greatest historical treatises of antiquity, was an event of such calamitous magnitude that Greece had never witnessed its like in all of recorded history. Not the Trojan War, not the Dorian Invasion, not even the recent Persian invasions could compare to the scale of the devastation that engulfed all of Greece for almost three decades, causing the deaths of tens, perhaps hundreds of thousands.

For the last few decades of the 20th century, the Catholic Church was blessed to have two of its most influential leaders guiding the Church and spreading its faith and message at the same time. Pope John Paul II made history by becoming the first non-Italian pope in several centuries, guiding the church for over 25 years. But while he led the Church, a remarkable woman born Agnes Gonxha Bojaxhiu (1910-1997) became one of the Church's greatest missionaries and humanitarians. She would come to be known to the world as Mother Teresa.

Actor. Dramatist. Poet. Husband. Father. Producer. Businessman. Servant of the Crown. All of the above can be applied to William Shakespeare. Certainly England's greatest playwright, he is still considered to be the most influential writer in the English language. Leaving behind a nearly unprecedented body of work to his credit, he addressed the full spectrum of the human condition and achieved what few other writers have in becoming a part of a global consciousness.

The Christian Church has no shortage of revered figures and saints, but it is difficult to find one that had a more decisive impact on the course of the Church's history than Augustine of Hippo. Augustine was a bishop of Hippo Regius in Africa, but his works, sermons and writings helped hold the Church together even as the Western Roman Empire was in its death throes, to the extent that every major branch of Christianity recognizes him today.

A lot of ink has been spilled covering the lives of history's most influential figures, but how much of the forest is lost for the trees? In Charles River Editors' Legends of the Middle Ages series, readers can get caught up to speed on the lives of the most important medieval men and women in the time it takes to finish a commute, while learning interesting facts long forgotten or never known.