But the show didn't just bring the actor a large fanbase. It was even responsible for introducing him to his future wife - actress Rose Leslie, who played Ygritte, his romantic interest in the series.
Together for 13 years, the couple tied the knot in 2018 and now have a three-year-old son and 15-monthold daughter, whose names they have kept private.
And although Kit has since starred in Netflix series Criminal: UK and Extrapolations on Apple TV+, the HBO drama Industry, set in the high-octane, ruthless and sexy world of finance, marks his return to the small screen after five years.
The son of businessman and baronet Sir David Harington, Kit, 37, plays Sir Henry Muck in the eight-part series - a part not too far removed from his own pedigree.
"I've known a lot of people like Henry," says the actor, a distant descendant of King James I and Lord Harington of Exton.
"I think what I found fascinating about him was that he can't see his own privilege, amazingly. He's within this net of privilege that he can't see out of and he can't see how he's held.
This story is from the October 21, 2024 edition of HELLO! UK.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the October 21, 2024 edition of HELLO! UK.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber? Sign In
STARS TURN OUT FOR THE EARTHSHOT PRIZE THE PRINCE OF WALES ROYAL HEADS TO CAPE TOWN FOR PRESTIGIOUS AWARDS CEREMONY
The Prince of Wales's love for Africa is well known: it is where he spent his gap year before heading to university.
FAMOUS NAMES TURN OUT FOR HALLOWEEN FRIGHT NIGHT STARS GO THE EXTRA MILE FOR SPOOKY STYLE
It may have been spooky season, but that was no excuse for stylish celebrities to abandon their sartorial flair.
BIDDING A BITTERSWEET FAREWELL TO 'VENOM' TRILOGY TOM HARDY ON FLYING HIGH, LOSING HIS TEMPER AND BEING INSPIRED IN HIS CHILLING MARVEL ROLE BY SON LOUIS
When Tom Hardy attended the UK premiere of Venom: The Last Dance in London, he was accompanied by a very special fan.
STARRING IN A NEW LOVE STORY WITH LIAM HEMSWORTH LAURA DERN TALKS OF THEIR CONNECTION - AND WHY VULNERABLE WOMEN ARE SUPERHEROES
The beautiful and dramatic scenery of Morocco's Atlas Mountains is the backdrop for Laura Dern's new film Lonely Planet, a love story in which she plays novelist Katherine opposite Liam Hemsworth's private equity hotshot Owen.
GRANDDAUGHTER OF LADY PAMELA HICKS MADDISON MAY BRUDENELL AND BRET KAPETANOV UNITE THEIR DIFFERENT WORLDS! IN SOCIETY COUNTRY WEDDING
In a heartwarming ceremony filled with love, Lady Pamela Hicks's granddaughter Maddison May Brudenell said: \"I will\" at a 15th-century village church in one of the most extraordinary society weddings of the year - and HELLO! was there to witness the historic occasion.
SPEAKING OUT IN POWERFUL NEW DOCUMENTARY THE QUEEN SHOWS HER PASSIONATE COMMITMENT TO SUPPORTING VICTIMS OF DOMESTIC ABUSE AND THEIR FAMILIES
The Queen has vowed to keep fighting for victims of domestic saying: Keep until I am able to no more.\"
PRINCESS BEATRICE AND NUTRITIONIST GABRIELA PEACOCK
HOW THE FRIENDS ARE SHARING THEIR PREGNANCY JOURNEY TOGETHER
AMERICA'S STYLE ELITE IS OUT IN FORCE FASHION'S FINEST A-LISTERS DIAL UP THE GLAMOUR TO HONOUR TOP DESIGNERS IN NEW YORK
Hollywood stars rubbed shoulders with New York's style elite as America's fashion industry gathered to honour some of its top designers.
LEGENDARY DANCER WAYNE SLEEP REFLECTS ON A LIFE IN THE SPOTLIGHT AND HOW BALLET LED HIM INTO SHOWBIZ
He has danced with some of the greatest legends of ballet, partied with the biggest names in showbusiness and performed with royalty.
SPORTY, INTELLIGENT AND SHOWING AN IMPRESSIVE SENSE OF STYLE LADY LOUISE SHINES LIKE A JEWEL IN THE ROYAL CROWN AS SHE TURNS 21
As she celebrates her 21st birthday this week, Lady Louise Mountbatten Windsor is growing up into an engaging young woman.