1. Roxanne McKee
Formerly on the English soap Hollyoaks and now appearing on the show Strike Back, McKee played handmaiden Doreah. She taught Daenerys the ways of pleasure, before ultimately being caught betraying the queen.
2. Burn Gorman
Gorman, of Torchwood and Pacific Rim fame, played one of the most despicable characters in the show's history: Karl Tanner. The night's watch brother turned on his commander and started a mutiny, later killed in combat with Jon Snow after many horrific deeds.
3. Finn Jones
While he may be better known now for playing Danny Rand in the Marvel Netflix show Iron Fist, we first saw Jones as Margaery Tyrell's brother Ser Loras.
4. Will Tudor
Known for Shadowhunters and Humans, this actor appeared in seven episodes as Loras' lover Olyvar.
5. Richard E. Grant
In what looked to be a guest star, but lasted for three episodes in season six, the actor played Izambaro, the lead actor of a Braavos theatre troupe.
6. Clive Mantle
Known for his numerous roles on British television over the last 30 years, including appearances on Sherlock and Shameless, Mantle played Jon Umber. Often called "the Greatjon", he fought for Robb Stark in the War of the Five Kings, before dying off screen.
7. Roger Allam
With plenty of roles over the years in shows such as The Thick of It, Allam played Varys' ally Illyrio Mopatis, and was there for Daenerys' wedding to Khal Drogo. He was later replaced by Ian McNeice.
8. Mackenzie Crook
The BAFTA-winner made his name in The Office, but most will know him for his comedic relief role in Pirates of the Caribbean. In Game of Thrones he played the wildling Orell, who would warg into an eagle.
9. Adewale Akinnuoye-Agbaje
To me he will always be Lost's Mr. Eko, but in the HBO show he played Malko, a captain of a slaving ship who captured Jorah and Tyrion in season 5.
10. Freddie Stroma
You may have seen him in UnREAL or as Cormac McLaggen in the Harry Potter films, but in season six he played Samwell's brother Dickon. Tom Hopper replaced him in the following season.
11. Rila Fukushima
Fukushima has appeared in both The Wolverine and the TV show Arrow, but she also had a brief but compelling appearance as a Red Priestess in season 5.