The Rijksmuseum in Amsterdam has received a significant donation: a 17th-century sketchbook containing thirty remarkably well-preserved drawings. The sketchbook remained in pristine condition due to minimal light exposure over centuries. Works within include drawings by Rombout Uylenburgh, a relatively obscure Friesian painter, of whom few works survive; the museum already holds one of his other known drawings. The sketchbook features large-scale biblical scenes, some rendered in blue ink on blue paper, offering new insight into Uylenburgh’s artistry and career, which spanned Poland and Danzig. Uylenburgh’s family became more prominent than the artist himself, notably through his brother Hendrick, an art dealer for Rembrandt van Rijn, who later married Uylenburgh’s niece. The sketchbook, previously known as the Van Eeghen Tekenboek and held by that family for 300 years, was identified as containing Uylenburgh's work through research culminating in a 2013 publication by RKD conservator Erik Löffler.