Season 4 Opening Idea
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As Rum Mehmed Pasha has been cast, I think we also need some Karamanid characters such as Pir Ahmed Bey and Kasım Bey.
Season 4 could start with the open-field battle between the Ottomans and Karamanids, almost like how Season 1 opened with a major battle.
After the Ottoman victory, Pir Ahmed escapes.
Mehmed enters Konya and appoints Şehzade Mustafa as its sanjak bey, while Mahmud Pasha is tasked with pursuing Pir Ahmed.
Mahmud Pasha eventually returns and reports that Pir Ahmed managed to escape.
Mehmed then returns to Constantinople. Before returning, he gives Mahmud Pasha another assignment: resettling people from the conquered Karamanid territories in Istanbul.
But this is where Rum Mehmed Pasha's rise could begin.
Rum Mehmed Pasha accuses Mahmud Pasha of not being harsh enough in carrying out the deportation of several hundred households from the conquered territories for the repopulation of Istanbul.
Rum Mehmed Pasha then takes over the operation and ruthlessly completes the deportations.
As a result, Mahmud Pasha is dismissed, while Rum Mehmed Pasha rises in influence.
This would give us a really interesting chain of events all stemming from the same Karaman campaign:
Karaman victory → Pir Ahmed escapes → Mustafa appointed in Konya → Mahmud Pasha fails to capture Pir Ahmed → resettlement order → Rum Mehmed Pasha's accusation → Mahmud's dismissal → Rum Mehmed Pasha's rise.
And importantly, it would give Mustafa a meaningful political and military role from the very beginning of the season, rather than already showing him as governor of Konya.