"Second, it says on C.S Lewis' official narnian timeline that calormen was inhabited by outlaws from archenland, and archenland was inhabited when Col, son of Frank the 5th led followers there."
Do not believe the timeline, pokemainiac. You have shown here how it is wrong. Col, Frank V son did not found Archenland. Read the end of MN, it states that Frank and Helen's (the first king and queen) second son founded Archenland.
I do not believe much of what is written on the timeline. Even the years of the events that concern the Pevensies on Earth are suspect.
We have had a thread elsewhere surrounding what can be considered canon and what should not. The m,ain things that can truly be considered canon are what is printed in the books. Since Lewis never definitively stated where the Calormene ancestors came from, anything, including the timeline, is speculation.
I'm trying to think how many generations it would take for a people to go from caucasian to dark-skinned. I gues it could be posible for a people to go from light-skinned to dark skinned within a millenia, but is that what happened or was there another group of people who were naturally dark-skinned who entered into the Narnian world?
MrBob