While the Lannisters are famous for their enormous wealth in Game of Thrones, House Velaryon is significantly wealthier in the timeframe of House of the Dragon. In the world of Game of Thrones, much like in the real world, money may buy influence and, more crucially, closeness to the Iron Throne.

While the Lannisters are famous for their enormous wealth in Game of Thrones, House Velaryon is significantly wealthier in the timeframe of House of the Dragon. In the world of Game of Thrones, much like in the real world, money may buy influence and, more crucially, closeness to the Iron Throne.

According to Game of Thrones, the Lannisters' wealth came from the Casterly Rock gold mines, which have sustained their affluence at court and power among the Great Houses.

But there came a period, during the House of the Dragon, when another family, the Velaryons, amassed wealth that eclipsed the gold of the Lannisters.

For the bulk of Westerosi history, the Lannisters have been regarded as the Great House with the most riches, but Corlys Velaryon affirms that his family held this position long before House of the Dragon episode 2.

While House Velaryon had long been friendly with the Targaryens, the family's genuine influence in the realm didn't come into being until Corlys was appointed Lord of the Tides. Corlys broke records on his nine voyages to Essos, making him the first Westerosi to go across the Thousand Islands and visit Nefer and Mossovy.

The Velaryons became richer than any other family in the realm, even the Hightowers and Lannisters, thanks to these expeditions where the Sea Snake loaded ships with gold, silks, jewels like jade, silks, and spices, as well as even elephants.

In a sense, the riches of House Velaryon sinks with Corlys Velaryon. Since the majority of the important figures in House Velaryon passed away during the Dance of the Dragons, when Corlys passes away from old age following House of the Dragon, his family's main influence has also passed away.