What is Matthew Crawley's fiancée in series two named?

Matthew Crawley’s fiancée in series two is Lavinia Swire.

Lavinia arrives as Matthew’s wartime fiancée after meeting him while he is home on leave from the First World War. She is the daughter of London solicitor Reggie Swire and is portrayed by Zoe Boyle. Her family connection to a Liberal minister also links her to the Marconi scandal storyline.

Lavinia remains devoted to Matthew after he is seriously injured and temporarily paralysed. Although Matthew tries to release her from the engagement, she refuses to abandon him. Her relationship with Matthew becomes complicated by his continuing love for Lady Mary Crawley, but Lavinia’s loyalty makes her an important emotional figure in the second series.

A common mix-up is confusing Lavinia with Mary’s fiancé, Sir Richard Carlisle, or with Matthew’s later wife, Mary. Lavinia dies of Spanish influenza before she and Matthew can marry, and her father’s inheritance later helps save Downton from financial collapse.