An exemplar of this is Byzantine empire, which entered into a long period of decline starting in the eleventh century, when its eastern borders began to be pressured by Turkish invaders. Some of these invaders, known as the Seljuks, seized provinces in the empire that supplied the Byzantines with revenue and food. The empire
An exemplar of this is Byzantine empire, which entered into a long period of decline starting in the eleventh century, when its eastern borders began to be pressured by Turkish invaders. Some of these invaders, known as the Seljuks, seized provinces in the empire that supplied the Byzantines with revenue and food. The empire