The Copper Sign by Katia Fox
Beginning in England in the year 1161, Ellen, a blacksmith's daughter wants nothing more than to follow in her father's footsteps. Unfortunately, such is not the lot for a girl. Circumstances arise where it is most convenient for Ellen to become Alan as she flees the wrath of her mother and the local lord.
Ellen has a great many adventures and learns a great deal as she travels through England and into Normandy and then Belgium.
This isn't historical fiction but it feels similar to it. It was originally written in German and the translator also translated The Hangman's Daughter which I also liked very much.
I really enjoyed this book. It had a great escapist quality to it and I very easily fell into the world of 12th century Europe.