From 2013 to 2015 Siddig played Aslan Al-Rahim (aka "The Turk") in the BBC historical fantasy drama series "Da Vinci's Demons". In 2015 and 2016 he appeared in the HBO series "Game of Thrones"; Siddig played the role of Doran Martell, the ruling Prince of Dorne, in the series' fifth and sixth seasons. He also played Reuben Oliver, an artist and suitor of Polly Shelby, in the third season of the British series "Peaky Blinders". Siddig also provided the voice of Wolf, a character in the historical fantasy drama "Tumanbay" that aired on BBC Radio 4 between December 2015 and February 2016.