Highgarden
From A Wiki of Ice and Fire
Highgarden is the seat of House Tyrell in the Reach. The Ocean Road meets the Roseroad at Highgarden.
History
It was once the seat of House Gardener, but when that line was destroyed on the Field of Fire, Harlen Tyrell, the steward of the Gardeners surrendered it to Aegon I. He recieved it and the title of lord paramount of the reach for that action.[1]