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[-JKP-]

Early 15th century MS. Canon. Misc. 378 (copy of Carolingian copy of 400 CE Roman MS) places several buildings of this type along the Nile. 

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Edit: just for clarity, the MS puts them everywhere, so they are used as a type rather than actual buildings.

Yes, it looks like they are used to indicate the portals (entrances), which is basically what many of the saddleback towers represented in those days.