A note by Robert Kerr, 1st Earl of Ancram, explains that it was written and presented to him by Princess Louise Hollandina, daughter of Frederick I of Bohemia, while he was in Holland after the death of her brother, Frederick Henry. It is signed by her brothers Charles, Rupert and Maurice, and her sister Elizabeth (folios 1 verso-2), and contains notes on the births and baptisms of Frederick I's children (folio 36).