The Lost Royal Dynasty Behind Westeros’ Reach and Highgarden Legacy – Explaining House Gardener in ‘A Song of Ice and Fire’

Long before the Tyrells ever raised their golden rose banner over Highgarden, another family sat the throne of the Reach for thousands of years. House Gardener ruled as the ancient Kings of the Reach, and their bloodline is woven into the backstory of nearly every noble house fans have come to know in ‘Game of Thrones‘ and ‘House of the Dragon‘.

Understanding who House Gardener actually was helps explain why Highgarden carries so much weight in George R.R. Martin’s world, and why so many great houses in the south trace their roots back to one mythical figure with a crown of flowers.

The Founding of House Gardener and Highgarden

House Gardener traces its origin to Garth the Gardener, who was the founder of House Gardener and builder of Highgarden. According to legend, he was the eldest son of the mythical Garth Greenhand, the High King of the First Men said to have been the ancestor of numerous houses of the Reach.

Garth is said to have made his home on the hill atop the Mander that in time would become known as Highgarden, and wore a crown of vines and flowers. From that single figure, an entire royal line was born, one that would dominate the region for millennia.

The scale of his legacy is hard to overstate. In the novels, half of the great noble Houses from the Reach claim descent from Garth Greenhand and House Gardener, with House Tyrell and House Florent being the most prominent, alongside houses like Rowan and Oakheart.

The Reign of the Kings of the Reach

For generations, House Gardener held power through a mix of conquest and diplomacy. Beginning with the mythical first king Garth the Gardener, firstborn son of Garth Greenhand, the Gardeners ruled through war and peace and the assimilation with the Andal invaders down the generations.

Their court was full of memorable figures. King Gyles III Gardener presided over Highgarden at the apex of its power, while King Garth X Gardener, known as Garth Greybeard, saw the house fall to its lowest point during his long reign. Other kings like Perceon III Gardener, who had House Manderly exiled from the Reach, show just how far the family’s political reach extended.

The seat of their power was just as symbolic as their crowns. Many Gardener kings, and one queen, sat upon a living throne called the Oakenseat, and wore crowns of vines and flowers in peacetime, switching to crowns of bronze thorns, later iron, when riding to war. Their blazon was a green hand over a white field, which inspired the chivalric Order of the Green Hand.

House Gardener’s influence did not stay confined to one bloodline either. Their initial rule was centered on Highgarden and the Mander river, but over time the Gardeners used their claimed descent from Garth the Gardener to assert supremacy over neighboring kings and lords.

The Fall of House Gardener at the Field of Fire

House Gardener’s story does not end peacefully. Their downfall came during Aegon’s Conquest, when the last Gardener king made a fateful alliance. King Mern IX Gardener and King Loren Lannister of the Rock joined forces and brought a substantial host to face the Targaryen army, which they outnumbered five to one.

For a brief moment, it looked like the combined southern armies might actually win. The battle proceeded in their favor until Aegon unleashed all three of his dragons at once, and the battlefield turned into a funeral pyre as thousands were slaughtered, with Mern and his heirs among them.

The scale of the devastation at what became known as the Field of Fire was staggering. The dragons killed four thousand men of the combined Lannister and Gardener army, among them King Mern. Mern died incinerated when Aegon unleashed Vhagar, Meraxes, and Balerion the Black Dread against the combined forces of the Reach and the Rock.

Even the physical symbols of Gardener power did not survive intact. The Oakenseat itself was destroyed during a later Dornish sacking of Highgarden, an event long remembered as the lowest point in the house’s history, according to details compiled by TV Tropes.

From House Gardener to House Tyrell

With the male line extinguished on the battlefield, the fate of Highgarden fell to whoever remained loyal at the castle gates. Harlen Tyrell, steward to the Gardeners, surrendered control of Highgarden to Aegon, and for this act Aegon promoted him and made House Tyrell the new ruling house of the Reach, to the fury of House Florent.

That fury was not without merit. The Tyrells can only claim descent from the Gardeners through the female line, while the Florents are directly descended from the Gardeners through a male line, since a younger Gardener brother had married into the Florent family. Yet because the Tyrells chose to yield the castle peacefully, the Targaryens passed over the Florents entirely and appointed the Tyrells as rulers of the Reach instead.

That single decision reshaped the entire political landscape of the Reach for centuries, and it still echoes in how fans read the rivalry between the Tyrells and Florents throughout ‘A Song of Ice and Fire’ and ‘Game of Thrones’. It also frames why Highgarden itself carries such enormous symbolic weight, since the Reach is the largest, most fertile region in Westeros, and control of it means control of the grain that feeds King’s Landing and the levies that could tip the scales of any war.

With ‘House of the Dragon’ continuing to explore the deeper history of Westeros, it is easy to see why the story of House Gardener still matters. Do you think the fall of House Gardener at the Field of Fire deserves its own flashback in a future season of ‘House of the Dragon’?