House Baratheon of Dragonstone

"The King has taken for his sigil the fiery heart of the Lord of Light."

- Melisandre to Renly Baratheon

Founded by King Stannis Baratheon, First of His Name, House Baratheon of Dragonstone is a cadet branch of House Baratheon of Storm's End and commands the allegiance of the lords of the narrow sea. Its seat is Dragonstone, the island seized by Stannis during Robert's Rebellion and received it as a reward from his brother, King Robert I Baratheon, though Stannis never wanted it.

Overview
House Baratheon of Dragonstone's current lord and head is Stannis I and its heir is Shireen Baratheon. This house is sovereign and doesn't recognize any overlord, and doesn't make alliances with any other faction unless they are absolutely obedient and submitted to Stannis's will.

Current sworn houses to King Stannis are: Bar Emmon, Celtigar, Sunglass, and Velaryon, from vulcanic islands in the Narrow Sea; Massey, Farring, Follard, and Chyttering, from the crownlands; Seaworth, Horpe, Peasebury, Fell, Wylde, Grandison, Morrigen, Caron, Wensington, from the stormlands; Florent and Meadows, from the Reach; Glover, Mormont, Umber, Karstark (treacherous), Flint, Wull, Burley, Harclay, Knott, Liddle, Norrey, from the North.

Before his defeat at the Blackwater Stannis had the support of most houses of the stormlands and other houses of the Reach and his army had many men and a massive royal fleet, built by Stannis for Robert in the past; among his leaders were many important powerful storm lords and some Reach lords. After his defeat most of them died or bent the knee to King Joffrey Baratheon. Ser Erren Florent, Queen Selyse Florent's youngest brother, is still held captive at Highgarden.

House Baratheon of Dragonstone remained divided in two factions: the king's men and the queen's men. Following the deaths of Robert I Baratheon and Renly, House Baratheon of Dragonstone is actually the only surviving branch of the original "House Baratheon". Renly died without issue, and while Robert had many bastard children they are illegitimate. There has been no mention in the books of other cousins of the main line who might continue it. As Stannis is the younger brother of Robert, not a far removed relative, his "House Baratheon of Dragonstone" technically became the de facto "House Baratheon" after Renly died, but Stannis continues to use his altered heraldry. Of course, the Lannisters continue to maintain the farce that Cersei Lannister's children are Robert's heirs, forming House "Baratheon" of King's Landing.

King's men
"Lady Melisandre is a priestess of the red god. Queen Selyse has adopted her faith, along with many others, but more of His Grace’s followers still worship the Seven. Myself among them"

- Davos Seaworth to Leona Woolfield.

Melisandre's strange faith, aggressive council, and mysterious powers make her unpopular among some of Stannis Baratheon's men. The king's men are members of Stannis Baratheon's court that hold to their worship of the Seven even after the red priestess, Melisandre, brought the faith of R'hllor to Dragonstone and converted Queen Selyse. Although they are loyal to King Stannis, they don't approve of the new religion and disapprove of many things such as burning people alive and sacred places and icons of other religions. According to Davos the king's men outnumber the queen's men in Stannis's host, and Stannis says half of his army is made of unbelievers. In the TV series most of Stannis' followers are actually converted to R'hllor.

Known king's men are Lord (formerly Ser) Davos Seaworth, Ser Andrew Estermont, Ser Gerald Gower, Ser Rolland Storm, Lewys the Fishwife, Ser Triston of Tally Hill, and Omer Blackberry.

Queen's men
"One realm, one god, one king! STANNIS! STANNIS! ONE REALM, ONE GOD, ONE KING!"

- Queen's men

The queen's men are members of Stannis Baratheon's court that have converted to the faith of R'hllor. Historically, Queen Selyse Florent was among the first in Dragonstone to convert, and it was initially by her insistence that Stannis took notice of the red priestess, Melisandre. Calling them the "queen's" men alludes to the fact that Selyse is a vocal supporter of Melisandre and of her god, arguably more so than Stannis himself, and helps in telling them apart from the so-called king's men who are also supporters of Stannis's cause yet have kept the Faith of the Seven. However, an alternate interpretation is that the queen they are loyal to is not Selyse but rather Melisandre, who is in many senses closer to Stannis than Selyse.

They often have a fiery heart, the emblem of the Lord of Light, embroidered on their breasts signifying their allegiance. In the TV series, most of Stannis' men after the Battle of the Blackwater become follower of R'hllor, unlike the book version.

Known queen's men are Lord Alester Florent, Ser Axell Florent, Lord Harwood Fell, Lord Sweet, Ser Richard Horpe, Ser Godry Farring, Ser Clayton Suggs, Ser Corliss Penny, Ser Justin Massey, Ser Brus Buckler, Ser Malegorn of Redpool, Ser Patrek of King's Mountain, Ser Narbert Grandison, Ser Benethon Scales, Ser Dorden the Dour, Ser Lambert Whitewater, Ser Perkin Follard, Merrel, Morgan, and Alf of Runnymudd.

Trivia

 * Many show fans who supported Stannis throughout the seasons immediately turned against him and considered the House Baratheon of Dragonstone unholy after Stannis murdered Shireen.
 * In TV series, following the deaths of Stannis, Selyse and Shireen Baratheon, House Baratheon of Dragonstone has become officially extinct, causing House Baratheon become legally extinct.