The Complete Guide to All 21 Major Houses on Game of Thrones

Location: Highgarden in the Reach
Motto: "Growing Strong"
Sigil: Golden rose on a green field
Major members:

• Margaery Tyrell, wife of King Tommen — Deceased
• Ser Loras Tyrell, brother of Margaery — Deceased
• Olenna Tyrell, grandmother to Margaery and Loras
• Lord Mace Tyrell, father of Loras and Margaery and head of House Tyrell — Deceased

Why They Matter:
House Tyrell had it all going for them, until they didn't. Mace, Loras, and Margaery all perish in the Sept when Cersei's plan to blow it up with wildfire is enacted.