""Growing Strong." Ha! The dullest words of any House.""
-Olenna Tyrell

The banner of House Tyrell of Highgarden, the rulers of the Reach.

House Tyrell of Highgarden is an extinct Great House of Westeros. It ruled over the Reach, a vast, fertile, and heavily-populated region of southwestern Westeros, from their castle-seat of Highgarden as Lords Paramount of the Reach and Wardens of the South after taking control of the region from House Gardener during the Targaryen conquest.

The House was formerly led by Lord Mace Tyrell. Mace's son Loras was a noted tournament knight and, secretly, the lover of Lord Renly Baratheon. Mace's daughter Margaery married Renly when he crowned himself king in the War of the Five Kings to cement an alliance between Renly and her father. Following Renly's death, Margaery was then married to King Joffrey Baratheon before his assassination at his wedding feast. She was then married to his younger brother, King Tommen Baratheon. Mace's mother, the indomitable Olenna Tyrell, assumed House Tyrell's lordship after Margaery, Loras, and Mace Tyrell were all killed by wildfire at the destruction of the Great Sept of Baelor. Under Olenna, House Tyrell realigned itself with House Targaryen and declared for Daenerys Targaryen in opposition against Cersei Lannister, who had orchestrated the downfall of House Tyrell. With the death of Olenna after the Sack of Highgarden, the House has officially become extinct. In the TV series, the Tyrell family is very small, has only four known members of the main branch.