Speedy's sources were correct: I have already checked 5 different sources all saying it was created in 2004 :
https://www.quora.com/How-did-ISIS-f...did-ISIS-begin
Origin
The group began in 2004 as al-Qaeda in Iraq, before re-branding itself as ISIS two years later. It was an ally of, and had similarities with Osama bin Laden's al-Qaeda.
Both were radical anti-Western militant groups devoted to establishing an independent Islamic state in the region.
The withdrawal of American troops from Iraq in 2011 left a security vacuum, one that ISIS has been able to exploit over the past year with the unintentional help of Iraq's Shia Prime Minister Nouri al-Maliki.
After U.S. departure, the Iraqi leader tried to cleanse the government and security forces of Sunnis —
who make up just over a third of the country's 33 million people.
Alienated and angry, many Sunnis have supported ISIS in its fight against the Shia-dominated central government.
But ISIS – unlike al-Qaeda, which disowned the group in early 2014 – has proven to be more brutal and more effective at controlling territory it has seized.