Sian Brooke was born in 1980 in Lichfield, Staffordshire, England as Sian Phillips. Before her appearance as Eurus on Sherlock, she was known for Under the Greenwood Tree (2005), Housewife, 49 (2006) and The Moorside (2017).
Sian is a graduate of Royal Academy of Dramatic Art (RADA).
Her surname is Phillips, but she changed it to Brooke for the actor's Equity to avoid being confused with veteran actress Siân Phillips. She chose the name Brooke after an English Civil War general who served at her home town of Lichfield.
Sian auditioned several times for Sherlock after being told that each of Eurus's disguises were separate roles.
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