You cannot understand ISIS without understanding al-Qaeda and the history they share, as well as the differences, there at the beginning, that would ultimately divide them.

In the face of danger, a pair of padres are finding and protecting ancient religious books and manuscripts from terrorists ...

ISIS’s meticulous use of language, and its almost pedantic adherence to its own interpretation of Islamic law, have made it a strange enemy, fierce and unyielding but also scholarly and predictable.

ISI/ISIS: First Iraq, then Syria By 2011, when the U.S. troop withdrawal was complete, AQI was being run by Abu Bakr al-Baghdadi, and had morphed from a largely foreign to a largely Iraqi operation.

ISIS eradicates art, history and music from curriculum in Iraq September 15, 2014 / 3:45 PM EDT / CBS/AP BAGHDAD -- The extremist-held Iraqi city of Mosul is set to usher in a new school year.

ISIS’ cleansing of rich, plural history is meant to trap those under its sway with enforced ignorance. World’s response must be education to keep history alive.

Watch FRONTLINE's documentary on the creation of ISIS, Abu Musab al-Zarqawi, Abu Bakr al Baghdadi, and U.S. failures to stop the group's brutal rise.

But, what is the ISIS flag he was carrying, and what's it's significance? What is the history behind the infamous flag? What does it symbolize? And what do the words on it say?

David M. Perry: Calling ISIS "medieval" is a serious mistake The claim that there's an inexorable conflict between Islam and "The West" is not based on history, but rhetoric used by extremists to ...

ISIS should be held accountable for slaughtering Yazidis, Muslims, Christians, and other so-called apostates. In the meantime, we must become more reflective, more willing to interrogate our ...

A Visual History of ISIS 5 minute read A beach scene on a Bank Holiday in Llandudno, Wales, 2013. Martin Parr—Magnum Photos ...