In 2010, Shirley Chaplin from Exeter went to an employment tribunal after she was taken off ward duties in her role as a nurse for refusing to remove a necklace bearing crucifix.
She claimed the Devon and Exeter NHS Trust Hospital was trying to prevent her from expressing religious beliefs. Mrs Chaplin said she had worn the cross for years without any complaints.
The Trust said its policy was due to health and safety concerns.
Shirley Chaplin lost her claim for discrimination but is now taking the case further. She's one of four British Christians launching a landmark case on religious freedom at the European Court of Human Rights today.
Mrs Chaplin's case is alongside that of another person forced out of their jobs for wearing crosses and a Christian registrar who wishes not to conduct civil partnership ceremonies.
The four will argue that the actions of their employers contravened articles 9 and 14 of the European Convention on Human Rights, which prohibit religious discrimination.