Sabrina Lois Bartlett (born September 1991)^[1] is an English actress. She is known for her roles in the BBC One miniseries The Passing Bells (2014), the third series of the ITV drama Victoria (2019), and the first series of Knightfall (2017) on History, Bridgerton (2020) on Netflix, and The Larkins (2021), also on ITV.

Bartlett was born in Fulham and grew up on Walham Grove. Her parents Stephen and Sharon are artists, and she has two sisters and a brother.^[2] Her grandfather was born in Calcutta.^[3] The family lived between London and Romney Marsh on the Kent coast.^[4][5]

Prior to acting, she took up ballet to help her coordination after a dyspraxia diagnosis and attended Tring Park School for the Performing Arts in Hertfordshire.^[6][7] She switched to drama and went on to train at the Guildford School of Acting, graduating in 2013.^[8][9]

Bartlett landed her first major role in The Passing Bells, a 2014 BBC One World War I television drama.^[10][8] She had a guest role in the Doctor Who series 8 episode "Robot of Sherwood".^[11] She played the recurring roles of Sophia and Keren Smith in Da Vinci's Demons^[12][13] and Poldark respectively.^[4]

In 2016, Bartlett appeared in the sixth season finale of the HBO series Game of Thrones, "The Winds of Winter" as a member of House Frey, then revealed to be Arya Stark in disguise.^[14] She starred as Princess Isabella in the first season of the History series Knightfall.^[15][16]

Bartlett was cast as Abigail Turner in the 2019 third season of Victoria.^[17] The following year, Bartlett appeared as Siena Rosso, an opera singer with a clandestine relationship with Jonathan Bailey's character Anthony Bridgerton in the Netflix historical fiction series Bridgerton.^[18][19]

In 2021, she was cast as Mariette in The Larkins, the eldest of the Larkins children, whom Catherine Zeta-Jones played in the previous adaptation.^[20] She revealed in 2022 that she would not be returning for the second series and her character was replaced by Joelle Rae.^[21] It was later revealed that Bartlett lodged a formal complaint against co-star Tok Stephen, but it was not upheld, leading to her departure.^[22]