© Randall Hobbet - All rights reserved - 2014 Getty Center, Los Angeles: This portrait, produced in the workshop of Rogier van der Weyden in about 1445, was based on a now-lost prototype. A woman of political ambition and power, Isabella of Portugal (1397-1471) became the duchess of Burgundy when she married Philip the Good in 1430. A later inscription identifies her as the Persian Sibyl, a female prophet from antiquity.