Editing Darius the Great (section)

===Egyptian campaign===
{{main|Twenty-seventh Dynasty of Egypt}}
After securing his authority over the [[Achaemenid Empire|empire]], Darius embarked on a campaign to [[Ancient Egypt|Egypt]] where he defeated the rebel forces and secured the lands that Cambyses had conquered while incorporating a large portion of [[History of Achaemenid Egypt|Egypt into the Achaemenid Empire]].{{sfn|Del Testa|2001|p=47}}  According to the Bisitun inscription, the Egyptian rebellion began while Darius was in Babylon dealing with [[#Babylonian revolt|the rebellion there]].  It has been suggested that the inclusion of Egypt among the list of rebelling provinces in this inscription was a scribal error, and various dates are possible for an actual rebellion.  Likewise, the identity of the rebel leader is not known, but it has been suggested to be [[Petubastis III]].<ref>{{cite thesis|title=Resistance against the Achaemenid Empire: the Egyptian Rebellions of 521 and 487/86 BC|last=Wijnsma|first=U.Z.|year=2023|pages=105–157|hdl=1887/3563357 |institution=Universiteit Leiden|degree=Doctoral|url=https://hdl.handle.net/1887/3563357|access-date=9 January 2025}}</ref>

Through another series of campaigns, Darius I would eventually reign over the territorial apex of the empire, when it stretched from parts of the [[Balkans]] ([[Thrace]]-[[Macedon]]ia, [[Bulgaria]]-[[Paeonia (kingdom)|Paeonia]]) in the west, to the [[Indus Valley]] in the east.