On the exterior, peer powers like the Parthian and Sassanid Empire in the East. On the interior, successful military leaders who tried to become emperor, weaken

On the exterior, peer powers like the Parthian and Sassanid Empire in the East. On the interior, successful military leaders who tried to become emperor, weakening the Empire from within, which then allowed foreign powers to invade (though some of them were invited as foederati) The author also talked about that in another post [1], though it's not the focus of it (mostly in the 'Kicking, Gouging and Screaming' part). [1] https://acoup.blog/2021/07/30/collections-the-queens-latin-or-who-were-the-romans-part-v-saving-and-losing-an-empire/ https://acoup.blog/2021/07/30/collections-the-queens-latin-o...