The Seventh Crusade took place from 1248-1254. The French King, Louis IX, set out from Aigues Mortes on the coast for Egypt but the entire enterprise failed, see http://www.historyofwar.org/articles/wars_crusade7th.html/
The name Amoun can be a variant of the Egyptian Amen, ancient god, or Amon. And, an Amoun along with Macarius founded monasteries located in the Egyptian desert in 330 AD or so, see Monastic Overview at http://www3.dbu.edu/mitchell/monasticoverview.htm/
Templars had been at the forefront of the Seventh Crusade effort, see http://gordonnapierhistory.blogspot.com/2010/04/knights-templar-and-crusades-overview_8833.html/
Would those Templars who returned have named this gate at La Couvertoirade after some aspect of their experience in Egypt. Or, had they, in the initial few years where Templars were in Jerusalem and did such activities as they liked (dug up grail, etc? mystic knowledge, documentation of some aspect of Christianity that the institution(s) did not want publicized, whatever) also access Egypt, travel there, under the watchful eye of our Saint Christopher.
Novelists, to your pens. FN 1
FN 1. Skip asking others to do your research. Origins of monotheism. Do it yourself. Amoun, Amun. This reference to Amun, for theology buffs and Egyptologists, and those who dig into what the Templars think they knew and when did they knew it, connects for some to the origins of monotheism itself, the verity of "Amen" or so be it or a confirmation of what one person says, the affirmation given by another by the Amen. Amun, or Amen, was an Egyptian deity during a particular period.
Again, Novelists, to your pens. Gate of Amun. Amen. Look up Thebes, and even this family is going to look up old slides of Thebes from 1961 (!) to see what it looked like then, and what we saw.
Read the history and fate of the Templars there, Order of Christ absorbing many of them, settling in Portugal, etc. Still, why is the name Amoun here? Amen. What do you mean by that? Where did it come from?