I love Tudor history and love to look at the picture galleries on this site. While browsing through pictures of Jane Seymour, I came across a sketch of her with her name given as "Iohanna." (it is the bottom picture in her gallery.) I know from studying latin myself that the letter I is often used instead of the letter J, but using the J instead so the name reads Johanna sounds more like the name Joan instead of Jane. Were the names Joan and Jane interchangeable or am I interpreting the name wrong?