in Barrow-in-Furness, England) is an English historian and author, who mostly writes about the 14th century.

Her best known work is biography of King Edward II of England.

Warner was born in Barrow-in-Furness, England, United Kingdom.

She studied history and literature on the Manchester University[1][2] and specialised in the 14th century.

[3] She has written several books describing the Kingdom of England during the 14th century and is best known for her biographies of Edward II[4] and his wife, Isabella of France.