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They became household names in the film and television industry thanks to their roles in HBO's Game Of Thrones.
And Richard Madden shared a sweet throwback snap on Thursday from when he and his co-stars Kit Harington and Alfie Allen had finished the first read-through for the fantasy series.
Trio - Actors - Wheel - Belfast - Fun
The trio of actors, who are all 32, looked youthful as they visited the Wheel of Belfast and took a fun snap together.
It was only in the first season that the three shared scenes together as Robb Stark (Richard), Jon Snow (Kit), and Theon Greyjoy (Alfie) respectfully.
Characters - Winterfell - Robb - Heir - Stark
The three characters grew up together in Winterfell, as Robb was the heir to the Stark family's ancestral home, while Jon believed he was the illegitimate son of the former's father Ned (Sean Bean).
Meanwhile, Theon was a ward of the Stark family, after his father Balon gave him to Ned in order to keep his seat as the Lord of the Iron Islands following the ironborn's defeat during Robert's rebellion.
Picture - Richard - 'This - Kit - Alfie
Of the picture, Richard joked: 'This is Kit, Alfie and I after our first read through of S1 Ep1 of Game of Thrones about 10 years ago. KIDZ.'
Richard hasn't appeared in the series since the third season, as Robb was tragically killed alongside his mother and wife during the Red Wedding.
Jon - Theon
Jon and Theon have since reunited...
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