[3] She was educated at Trinity Hall, Cambridge, where she graduated BA in 1986, then trained as a barrister at Gray's Inn, London.

Without knowing any of the detail of its provisions or its history, Magna Carta establishes the principle that Kings (or Prime Ministers) are subject to man-made law and to the judges who uphold it...

"[10]Lieven was a Labour Party councillor for the Somers Town ward on the Camden London Borough Council from 1994 to 1998.

[11] In June 2019, on the application of a National Health Service Trust in charge of an ante-natal clinic, Mrs Justice Lieven made an order in the Court of Protection for a pregnant Nigerian woman with learning difficulties to have a forced abortion against her wishes, on the grounds that it was in her best interests.

[14][15] In March 2021, Mrs Justice Lieven had to consider whether a transgender teenager with gender dysphoria who wished to continue with puberty-blocking drugs needed the permission of the court to do so.