Wildebeest in North Africa?

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Presently, Blue Wildebeest are only located within southern and eastern Africa. I need to know if they and/or their subspecies ever occurred in North Africa below the Sahara, and if so, when. I found this from a site regarding vanishing antelope, but I'm not sure if it's genuine:

"A century ago the Blue Wildebeest were the dominant herbivores in acacia savannah plains and ranged the entire continent except for deserts, forests and high mountains. Today there are none north of the Sahara. The Serengeti and south Sudan have the remaining massive herds that indicate their former abundance."

I appreciate any given answers.