Regina Basilier (née Kleifeldt 1572–1631), was a Swedish (born in Poland-Lithuania) merchant and moneylender.
[1] She was born in Danzig (which was then part of the Polish-Lithuanian Commonwealth) and married to the Hamburg merchant Adam Basilier (d. 1608), who was a significant creditor of the Swedish prince John, Duke of Östergötland.
[2] She also continued a lucrative trading import business of textiles and jewelry and was a provider of such luxury items to the Swedish royal family.
She is, for example, recorded to have sold bed draperies to Christina of Holstein-Gottorp, wallpaper to Gustavus Adolphus of Sweden, and jewelry for Maria Eleonora of Brandenburg.
[3] She died as the perhaps greatest creditor of the crown and one of the most successful and influential merchants in Sweden.