06/30/2015 11:55 am ET Updated Nov 16, 2015

This Timeline Shows The Lightning Rise Of ISIS

It's been exactly one year since the extremist group known as ISIS changed its name to "Islamic State" and declared a caliphate in parts of Syria and Iraq. The militants symbolically marked the occasion by obliterating part of the border between the two countries.

Less than a month before, on June 10, 2014, the extremists had surprised the world by capturing Mosul, Iraq's second largest city, from a fleeing Iraqi army.

Take a look at the timeline below to learn more about some of the major events in the group's lightning rise.