From A Wiki of Ice and Fire
Knights inquisitor are knights tasked by the Iron Throne to investigate and punish threats.
After the fall of King's Landing, Queen Rhaenyra Targaryen sent hunting parties of knights inquisitor in search of the fugitive King Aegon II Targaryen, Princess Jaehaera Targaryen, Prince Maelor Targaryen, Lord Larys Strong, Ser Willis Fell and Ser Rickard Thorne. Rhaenyra's knights inquisitor were also tasked with punishing those who had given aid to the fugitives.
- ↑ 1.0 1.1 Fire & Blood, The Dying of the Dragons - Rhaenyra Triumphant.