When did the first season of the Game of Thrones TV series air?
Game of Thrones (season 1)
After the pilot was shot and the series picked up, it was announced that the role of Catelyn had been recast, with Michelle Fairley replacing Ehle.[51]  Later, it was also confirmed that Emilia Clarke would replace Tamzin Merchant as Daenerys.[52][53] The rest of the cast was filled out in the second half of the year, and included Charles Dance as Tywin Lannister, Aidan Gillen as Petyr 'Littlefinger' Baelish, and Conleth Hill as Varys.[11]