Hi there - we're happy to approve your question related to your novel, and we are happy for people to answer. However, we should warn you that many flairs have become reluctant to answer questions for aspiring novelists, based on past experience: some aspiring novelists have a tendency to try to pump historians for trivia while ignoring the bigger points they were making, while others have a tendency to argue with historians when the historical reality does not line up with what's needed for a particular scene or characterization. Please respect the answers of people who have generously given you their time, even if it's not always what you want to hear.

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I’ll suggest William Marshal, 1st Earl of Pembroke.

He’s known as the perfect knight. Lived from 1146-1219. Served 5 kings including Richard the lionhearted and king John and served in the Crusades.

Didn’t die in battle though