by Heather R. Darsie Sibylle von der Mark, simply known as “Sybylla of Cleves” during her lifetime, was born on 17 July 1512. Sybylla eventually became older sister to Anna von von der Mark, more commonly known as Anne of Cleves or Henry VIII’s fourth wife, in 1515. Sybylla, the eldest of Maria von Julich-Berg’s children with Duke Johann  III of Cleves, was elevated to … Continue reading Sybylla, the Other Daughter of Cleves