Edith was the wife of Wulnoth. She willingly gave food to the First Doctor in 1066 and helped Vicki and Steven Taylor find their way to the monastery. She was captured by Gunnar and injured in a Viking attack on her village.
Behind the scenes
On screen, it is implied, but never directly stated, that Edith was raped by the Vikings. This is made a little bit clearer in the novelisation, which states that they had a "lustful gleam in their eyes" and Sven is described as a "violater of women".