The rise of Islamic State and its declaration of the caliphate can be read as part of a wider story that has unfolded since the formation of modern nation states in the Muslim world.
Despite what we're told, religion isn't inherently peaceful. People kill in the name of their religion, just as they love in its name.
What makes Islamic State different to traditional Islam isn't necessarily the religious texts the group uses.
How far back in history does one have to go to find the roots of the so-called Islamic State? The first article in our series on the genesis of the terrorist outfit considers some fundamentals.