Johannes Leo was a jurist and the husband of Elizabeth Jane Weston.
In 1603, he and Elizabeth married. A month later, Elizabeth received a wedding present from John Dee: a painting. Elizabeth and Johannes examined the painting, depicting the Virgin Queen Elizabeth, with two ladies in waiting behind her and three goddesses facing them. Johannes remarked that the three goddesses could be "Hera, Athena and Aphrodite" the three goddesses judged by Paris, and Elizabeth noticed a golden orb in the Queen's hands, similar to the one she found in Dee's armoire years before.