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At the start of the series, the Tyrells were giving the Lannisters a run for their money as the richest house in Westeros. The pivotal assets were a vast amount of fertile land and a large population that paid taxes. House Tyrell had the ability to raise a large army—backing Renly Baratheon in Season 2 created a unified force of 100,000 men—but this military capacity was regarded as far inferior to the Lannisters' battalions.
The continuation of House Tyrell went from grim (after the death of heirs Margaery and Loras) to doubtful. Lady Olenna, the de facto head of the family, poisons herself after the Lannisters seize Highgarden. This formerly wealthy family may be wiped out.
This article was provided by Bloomberg News.