As a historian, I went in a tour in the western side of the city, which is considered as the Islamic side of the first conquest process, year 17 H [Islamic calendar] [year 639 Christian calendar]. I can say that ISIS presence is spread in “Islamic Conquest area” and all their ideological movements are within this. Their largest spread and even their legitimate centers are in the heart of this area; Al-Mushaheda area, Bashtabiya and the western side of river Tigris where the first Islamic mosque was founded in the city- Musfi Al-Dhaheb mosque currently (Al-Masjid Al-Amawy previously).
Mosul Eye 
As a historian, I went in a tour in the western side of the city, which is considered as the Islamic side of the first conquest process, year 17 H [Islamic calendar] [year 639 Christian calendar]. I can say that ISIS presence is spread in “Islamic Conquest area” and all their ideological movements are within this.
There is defiantly miss/ self-motivated what you wrote above.
I you read the history of Islam and Islamic empire or conquest process, you defiantly read how early Muslims were advised by Prophet Mohammed ﴿ص﴾or Khalifa (الخلفاء الراشدون) After him were very clear when it comes to new Conquest areas and saving human life specially women and kids even the animals and vegetation’s or tree or food farms, you need to go to read and check by yourself what Hadith by Prophet Mohammed ﴿ص﴾ or other early Islamic Khalifa.
To your interest if you really knew Early Islamic history the advise to Leaders for Islamic military commanders like Khalid Bin Alwaleed & Saad Bin Waqass with regards of Women, Kids and plant life.
During Early and later Islamic Conquest areas there were never been any historical site was demolished or stolen or damaged, in facts Khalifa Omar Bin Khatab رض when he entered Jerusalem he left all Christian , Jews holly places intact in fact the most evidence is he use a church to be as Masjid without demolish any original artwork or artefacts for that church and same things happen afterward.
During Amway conquest process or Abbassy conquest process followed by whomever after that ended with Othman Empire, the Churches, synagogues still there and not demolished or damaged or taken over.
So this was the history of Islamic Conquest areas, if you are a historian who dear about history you should be first to know the difference between real Islam and what these mongers ISIS or ISL terrorist doing in name of Islam.
Go read and educate yourself well before spreading western view propaganda about ISIS/ISL you defiantly know who created and how are they.
Tell me more all those TV/ Media showing those Afghani/Pakistani dressed terrorists with Redbeard faces and all sort of ugliness why when Iraqi forces and western forces kills them we did not see any of their dress or faces or even those TOYATA cars??
Why ISIS/ISL not passing TO Israel if they are real Muslims?
Why the do not fights in Gulf with full US military bases their even Turkey?