From A Wiki of Ice and Fire
The Noble and Puissant Order of the Warrior's Sons are an order of knights sworn to the Faith of the Seven. They are part of the Faith Militant, and are otherwise known as the Swords. Their counterparts are the "Stars" or Poor Fellows. They only obey and answer to the High Septon, as they believe the High Septon speaks for the Seven.
The order had not existed in the realm since Jaehaerys I. However, after the War of the Five Kings in 300AC, the ruling King Tommen Baratheon, under the edict of his mother and Regent Cersei Lannister, overturned Maegor the Cruel's law which forbade holy men from being armed, and the order was reborn. Over a hundred knights have so far pledged their swords and lives to the Warrior's Sons and obey the new High Septon, known by many as the High Sparrow.
Only an anointed knight can join this order. Most of the Warrior's Sons are former hedge and household knights, but some are of higher birth such as younger sons of lords, or older lords who wish to atone for their sins. Some lords even renounce titles, castles, and lands to serve the Warrior's Sons and the Seven, such as Lancel Lannister. The Warrior's Sons' duties are often to protect Holy Septs or to escort the devout safely across the land protecting them from brigands and the unfaithful.
The original order developed a reputation for fanaticism and implacable hatred for enemies of the Faith; they see any who worship other gods as false and evil. They are said to have been holy men, ascetics, sorcerers, dragonslayers, and demonhunters.
Swords wear inlaid silver armor over hair shirts, rainbow cloaks, and swords with star-shaped crystals in their pommels.
|“||"The Faith Militant reborn..."||”|