The rough timeline here is given in relation to Aegon’s Landing, using negative numbers for events before Aegon’s Landing.

Dawn Age (before -12,000)
In the Dawn Age, Westeros is inhabited by the fairy-like children of the forest, and possibly by giants in the far North.

ca. -12,000
The First Men come to Westeros from the eastern continent, via a land bridge then connecting the two land masses. The First Men introduce bronze, leather shields, and horses. After initial fights, which include the destruction of the land bridge, they reconcile with the children and sign the Pact on the Isle of Faces, which brings about a four thousand year peace in Westeros. The First Men adopt the gods of the children, the nameless gods of the forest. The fortress of Moat Cailin is built circa 10,000 years ago.

The Long Night (Age of Heroes, ca. -8000)
At the time of a terrible winter that seems to last for a generation, a demonic race called the Others invade from the north and nearly destroy all men in Westeros. The Others are finally defeated at the War for the Dawn by an alliance of men wielding fire and obsidian weapons led by a great hero, who in an eastern tradition is named “Azhor Azhai”, and wields a great sword of fire, Lightbringer. This is the time when the Wall is built, a giant fortification in the north of the continent protecting the races of men from the menaces of the north. The Sworn Brotherhood of the Night’s Watch is created to man and guard it. According to other legends, this is also the time when the castle of Storm’s End is built in the south, and the designer of the Wall, Bran the Builder, also constructs Winterfell and becomes the first King in the North.

After ca. -8,000
The thirteenth Lord Commander of the Night’s Watch is seduced by a wildling woman from beyond the Wall and becomes the Night’s King, with the Watch as his personal army. The Starks in Winterfell and the King-Beyond-the-Wall, Joramun, join forces to defeat the Night’s King and restore honour to the Watch. This may be the same Joramun who also finds the Horn of Winter, which it is said he uses to awaken giants from the earth.

ca. -6,000
The Andals invade Westeros with steel weapons and their religion of the Faith of the Seven. They fight both the First Men and the children of the forest, finally extinguishing the latter everywhere south of the Wall. After centuries of fighting, the Andals establish six kingdoms in the south, while the north remains in the hands of the First Men, due in large part to the strategically located fortress of Moat Cailin resisting multiple attempts to take it and thereafter serving as the door between North and South.

ca. -1,700
A warrior of Dorne forges a great and powerful sword from a fallen meteorite. The sword, Dawn, becomes the greatest heirloom of House Dayne. The castle of Starfall is named for this occasion.

ca. -700
Fleeing Valyrian expansion, Nymeria, warrior-queen of the Rhoynar city-states, evacuates her people from the eastern continent in ten thousand ships across the narrow sea and lands in Dorne. Winning an alliance with Lord Mors Martell, the Rhoynar unify the fractious land under the rule of Sunspear and establish House Martell as the ruling house of Dorne. Mors adopts the Rhoynish title ‘Prince’ rather than ‘King’. The Rhoynar bring no greater political turmoil, though the southernmost kingdoms are heavily influenced by their customs, including equal primogeniture.

ca. -200
The Valyrian Freehold annexes the island of Dragonstone off the eastern coast of Westeros. A Valyrian noble family, the Targaryens, take control of the island.

ca. -100

1 Aegon’s Landing – The War of Conquest
Two centuries after the Doom of Valyria, Aegon Targaryen invades, subdues, and unites six of the seven kingdoms of Westeros under his banner and constructs a new capital city at King’s Landing. He is unable to conquer Dorne and allows it to remain sovereign. With the destruction of the Storm King, Argilac the Arrogant, and the death of the last King of the Reach, control of the castle of Storm’s End passes to Aegon’s bastard half-brother Orys Baratheon, and of Highgarden to Lord Harlen Tyrell. Edmyn Tully of Riverrun is named Lord of the Riverlands and Vickon Greyjoy of Pyke becomes Lord of the Iron Islands.

On Aegon’s death, the Faith of the Seven revolts against the Targaryens. Aenys I assigns his brother and heir, Maegor, to deal with the crisis.

Death of King Maegor the Cruel. King Jaehaerys I ends the rebellion through diplomacy, promising amnesty if the Faith Militant disbands. They agree. Jaehaerys becomes known as “The Conciliator”.

The Dance of the Dragons, the first major Westerosi civil war, between Aegon II and his half-sister Rhaenyra Targaryen for control of the Iron Throne. Many lesser branches of House Targaryen and most of their dragons are extinguished in the conflict. After Rhaenyra’s death, the war continues in the name of her son, Aegon. When Aegon II dies without issue, the war ends by default with Aegon III being crowned. The last Targaryen dragon dies during Aegon III’s reign, earning him the name “Dragonbane”. The dragon leaves behind three stone eggs, which the Targaryens fail to hatch.

House Corinthyen is founded by the brothers Halpern and Aelius, in the first of several incidents which marked the house’s rise in both fame and infamy.

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