English: Under king Zacharias IV, the Nubians managed to advance as far north as Akhmim, benefiting from the weakness of the Ikhshidids. Upper Egpt, or at least parts of it, remained occupied for some time (interpretation derived from Roland Werner's "Das Christentum in Nubien"). It would also have extended far into the south, for Ibn Hawqal, who visited Nubia during the 950's, claims that the kings of Dongola asserted control over a region west of the White Nile.