- "Instead of using the castle for what it was built to do, Harlen Tyrell surrendered it to Aegon without a fight. In exchange, Harlen was given the castle his family had served for thousands of years with all its attendant lands and lords, including my family. Perhaps the Tyrells were great once, but Harlen gave away their honor when he opened gates that weren't his to open, and, to a foreign invader. Ever since, there hasn't been a Lord Tyrell who wasn't a mockery of the title."
- ―Randyll Tarly
Lord Harlen Tyrell was the High Steward of Highgarden during the reign of King Mern IX of the Reach. After the death of his king in the Field of Fire, Harlen surrendered Highgarden to Aegon the Conqueror. Afterward, Aegon elevated Harlen to Lord Paramount of the Reach and Warden of the South and House Tyrell to the status of a Great House.
According to Olenna Tyrell, Harlen was like most Tyrell men and grew up banging steel too loudly for thought to penetrate, like his descendants Luthor, Mace, and Loras. She also implies that it was Harlen's wife who came up with the idea to surrender to Aegon and convinced Harlen to go along with it.
In the books
In the A Song of Ice and Fire novels, Harlen Tyrell's story is the same.
|Lord:||None, extinct||Heir:||None, extinct|
|Title(s):||High Steward of Highgarden · Lord of Highgarden · Lord Paramount of the Reach · Warden of the South|
|Ancestors:||Garth Gardener · Harlen Tyrell · Lyonel Tyrell|
|Deceased members:||Luthor Tyrell · Mace Tyrell · Margaery Tyrell · Loras Tyrell · Olenna Tyrell · Tyrell lady · Alerie Tyrell|
|Household:||Mira Forrester · Sera Durwell|
|Overlord:||House Targaryen · House Baratheon of King's Landing (formerly) · House Gardener (formerly)|