Trolloc Wars

Map
The land of the Ten Nations, as it stood. [| "Ten Nations"]

http://encyclopaedia-wot.org/history/eharon/londaren_cor.html

Language

 * Translated in 300 AB to what was then called the "Vulgar Tongue". End of Last Chapter, CoS

World

 * White cloaks haven't even been thought about yet
 * Days before the trolloc wars, when no ruler held a throne without the towers approval. - CoS Prologue
 * Old Tongue, power wrought possibly, and older times. Age of legends did not have much strife, so I'm not sure about weapons, but I would almost wager, the Ashendari of Mats came from this time, or at least between the Breaking and the Trolloc Wars.

Aridhol

 * After the Trolloc wars lasted long enough to dwarf the war of the hundred years. A man named Mordeth became a counselor at that time. He counseled the rule that to win to survive Aridhol must harder than the shadow, more cruel than the shadow, less trusting. Slowly they made it so until in the end Aridhol became if not blacker than the shadow, as black. Aridhol eventually turned back on itself.

Channelers

 * Aes Sedai swear the Three Oaths sometime between the trolloc wars, and the Hundred Years war (nearly 1000 years later)
 * Power wrought weapons were thought to be mostly, if not all made before the Trolloc Wars (DM decision if they're still being made)
 * Making of Angreal, Sa'Angreal and Ter'Angreal have been lost since before the Breaking of the World

The Ways

 * The ways still stand! Corruption of the Ways

Far Madding

 * I don't know for sure what name it was using, but I keep getting references saying the Guardians (artificial stedding Ter'Angrael) were not in place until after the trolloc wars.

Ogier

 * Common place in the world these days.
 * Pretty much all inns have at least 2 or 3 Ogier rooms.

Stedding

 * Great information about old cities, and stedding locations, with some dating listed: Lord of Chaos Chapter 20

White Tower (Aes'Sedai)

 * Long ago formal ceremonies were held clad in the light. LoC CH 35

Cairhein

 * Rules after coronation give gold, food, finery for a week. Rulers are more popular in their first week than the rest of their tenure. - CoS ch4
 * Free access to the city for coronation festival. Not even someone under order of arrest can be denied or detained. It is tradition.
 * al'cair'rahienallen - the golden dawn hill

Border Lands

 * “I will,” she said. “Honor’s truth.”
 * ... Even so, he gave the proper response for a Barashandan lord, accepting her pledge. “The honor of blood; the truth of blood.”