House Tarly of Horn Hill is a noble house of the Reach, one of the strongest sworn to House Tyrell. Horn Hill is located in the foothills of the Red Mountains.
Their sigil is the striding huntsman on green.
Their motto is "First in Battle".
During the reign of Aenys I Targaryen, Savage Sam Tarly was among the marcher lords who participated in the Vulture Hunt.
Lord Alan Tarly declared for the blacks during the Dance of the Dragons.
The Tarly huntsmen was spotted by Dunk among the heraldry on display at the tourney at Ashford Meadow. Ser Samwyle Tarly is listed as having competed at the tourney.
Lord Randyll's father was unhorsed by Ser Denys Mallister in a tourney.
During Robert's Rebellion, Lord Randyll Tarly commanded the vanguard of the Reach at the Battle of Ashford, where he killed Lord Cafferen and forcedRobert Baratheon to retreat. Mace Tyrell, however, takes credit for the victory.