Jason Lannister born 89 AC

In 112 AC Rhaenyra Targaryen traveled to the Westerlands, and Casterly Rock welcomed her with a feast where Jason and his twin brother Tyland openly vied for her attention.

Not long after, Jason married Lady Johanna Westerling, daughter of the Lord of the Crag. They had five daughters — among them Cerelle and Tyshara — and a single son, Loreon, his heir.

He was described as a tall, fair-haired, good-looking man.

When the Dance of the Dragons began, Lord Jason declared for Aegon II and raised a host of a thousand knights, with seven times that number in soldiers and archers, to strike the Riverlands from the east.

The plan was to link up with Prince Aemond, who was advancing from the west with troops brought from King's Landing, so the two could meet at Harrenhal, then held by Daemon Targaryen.

Ordered to cross the Red Fork, Jason found the crossing held by the men of Lord Petyr Piper and Lord Tristan Vance. On the third attempt he was mortally wounded by a squire, who was knighted for the feat. Lord Humfrey Lefford then took command of his men, but the march that followed ended in disaster.

While Jason fought in the Riverlands, the Red Kraken landed with his ironborn at Lannisport, sacked the town and carried off hundreds of women and girls to make them salt wives. Among those taken were Jason's favorite mistress and the daughters he had had with her.

His son Loreon inherited Casterly Rock, but since he was only four years old, it was his mother, Lady Johanna, who ruled in his name and had to deal with the raiders and with the aftermath of the civil war.