The Northerners, descended from the First Men who were never conquered by the Andals, have a decidedly negative view of the Andal invasions.
The dating system is based on the Targaryen Conquest.
Thus all dates are "BC" for "Before Conquest" or "AC" for "After Conquest".
Territories and their rulers: House Stark, the North (white); House Arryn, the Vale of Arryn (dark grey); House Frey, the Riverlands (dark blue); House Greyjoy, the Iron Islands (dark yellow); House Lannister, the Westerlands (dark red); House Tyrell, the Reach (green); House Durrandon, the Stormlands (yellow); House Martell, Dorne (orange) House Targaryen, the Crownlands (brown); Night King (formerly the Free Folk), Beyond the Wall (light blue); Lord Commander of the Night's Watch, the Gift and the Wall (black) The debt crisis with the Iron Bank of Braavos reaches a breaking point: with far less confidence in Cersei than Tywin, the bank starts calling in its loans - which the Iron Throne cannot possibly repay.
Even more simple "cultural traditions" and oral histories have much to say on the subject but no hard evidence.
Some of these oral traditions are known to be simply inaccurate: the Dothraki believe that the first man came into being one thousand years ago, when even the written histories of other continuous civilizations stretch back five to six thousand years.
Other characters are older (Eddard Stark and Robert Baratheon are ten years older than their book counterparts) or younger (Ser Vardis Egen is decades younger than in the book, while Theon is two years younger), though for the most part this has no bearing on the timeline.