For award-winning, internationally-acclaimed author Rosemary Sutcliff (1920-92). By Anthony Lawton: godson, cousin & literary executor. Rosemary Sutcliff wrote historical fiction, children's literature and books, films, TV & radio, including The Eagle of the Ninth, Sword at Sunset, Song for a Dark Queen, The Mark of the Horse Lord, The Silver Branch, The Lantern Bearers, Dawn Wind, Blue Remembered Hills.
I think I now have correct the list correct of books by Rosemary Sutcliff that feature the signet ring with a dolphin design. Her signature also featured a dolphin. In chronological order the books are (click on the titles to find posts on this blog about each book; click here to find summaries of each one):