Who is Osmond the Mason from Sarum: The Novel of England and what is their importance?

Osmond the Mason lives in thirteenth century Sarum and is married to Anna and has a son, Edward, and two daughters. He spends his life working on the great cathedral at New Salisbury. He is accepted into the mason's guild three years earlier than normal because of his talent. He battles the seven deadly sins throughout his life and is eighty years old when the cathedral is completed.