In 129 AC House Targaryen held twenty dragons and two heirs with a claim to them. The war between the heirs spent the dragons on itself. Scroll, and each dragon flies the war's routes at its relative size, the two courts move and fall around them, and every death leaves a mark on the land.
Scroll, or use ↓ ↑. M shows the maester's notes: the clean geometry under the hand. Hover a dragon or a figure for its name.
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The same frame at the same scale. On the left, every dragon in the Seven Kingdoms in 129 AC; on the right, the four left alive in 131, over a map that carries every death between. No counterfactual: just the two pictures.