Largest possible Caliphate

[Elfwine]

Maybe somehow you could create a HRE like Caliphate though Iguess that's not what the OP want.

What do you mean by HRE like?

Arguably, the idea of the Caliph being Commander of the Faithful (all the faithful) and exercising less than nominal authority over most of Islam might already meet that.

 

[eliphas8]

Maybe somehow you could create a HRE like Caliphate though Iguess that's not what the OP want.

Honestly the Caliphate was better at being the HRE than the HRE, it was really decentralized.

 

[Ridwan Asher]

Possible addition to Caliphate territory during its greatest would be Byzantine realm, southern France, and perhaps Nubia.

 

[Elfwine]

But how is the Caliphate taking more of the Byzantine Empire than it managed OTL?

I'm not going to say it was impossible, but it seems pretty difficult.

 

[Ridwan Asher]

Easier then India at any rate.

 

[eliphas8]

But how is the Caliphate taking more of the Byzantine Empire than it managed OTL?

I'm not going to say it was impossible, but it seems pretty difficult.

Depends on the parts they're taking (also how thoroughly they can decapitate the leadership in the initial invasion). If the Empire has no clear leadership and the generals are vying for power it's much more likely that they will be able to take more Byzantine lands.