|Title|| Lord Paramount of the Mander|
Lord of Highgarden
Warden of the South
|Book(s)||The World of Ice and Fire (mentioned)|
Theo inherited his lordship in 5 AC after his father perished in the First Dornish War. Theo was reluctant to take any further part in the war against Dorne, but was embroiled when the conflict spilled out beyond the Red Mountains.
After the Targaryens made peace with the Dornishmen, Theo spent his time consolidating Tyrell power. He called a council of septons and maesters to examine and dismiss the claims put forth by other Houses of the Reach trying to claim Highgarden.