Starting his career as a child, actor Nathanael Saleh first caught the public's attention with a role on the very adult "Game of Thrones" (HBO, 2010-19). A native of Britain, he began acting in stage productions at the age of five the Playbox Theatre in Warwick, England. It was not long before he was cast in the role of Arthur on "Thrones." His character was a young spy for Conleth Hill's Varys, before moving under the command of Anton Lessar's Quyburn. The part served as a springboard for the young actor to be cast in the big-budget Disney musical "Mary Poppins Returns" (2018), acting alongside Emily Blunt and Lin Manuel Miranda. Saleh played John Banks, one of the children of the now grown Michael Banks character from the original "Mary Poppins" (1964). On a smaller scale, he appeared in the comedy "Days of Bagnold Summer" (2018) with Tasmin Greig. He then joined the cast of "The Letter for the King" (Netflix, 2019-) based on the Dutch children's book about a medieval squire sent on a dangerous delivery mission.