I have heard that the Fatimids had a standing army which included a significant number of mercinaries. This was also true of the Byzantines. I understand that the Varangian and Bulgarian Brigand units represent the mercs in the Byzantine standing army, and the Byzantine faction can raise them like regular troops instead of hiring them inns because they were, for practical purposes, part of the standing army, not specially hired short term.

So I was wondering, are there similar Egyptian units? In other words, does the Egyptian roster include units which in real life were mercinaries but part of the standing army, not just short term hire? Can anyone help me?