The book was written after the author lived in Egypt and visited several Coptic families in the Delta and Upper Egypt.
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In the John Bellairs book The Trolley to Yesterday and its eventual sequel The Wrath of the Grinning Ghost, the character of Brewster (really Horus, a god of Upper and Lower Egypt) is given his name because he bears a resemblance to Brewster Rooster.
Consequently, Kaplony equated Horus Sa with njswt-bity Wr-Za-Khnwm, "The king of Upper and Lower Egypt, Wersakhnum" and credited him a reign of 2 months and 23 days during the interregnum between Khasekhemwy and Djoser.
It marks a final waning of the power of the centralised monarchy, with Ramesses XI still nominally pharaoh, but with Herihor as High Priest of Amun in Thebes and Smendes in Tanis ruling respectively Upper and Lower Egypt.