The crypts of Vilnius Cathedral are a place where prominent figures of Lithuania and the Catholic Church are buried. At the Royal Mausoleum Grand Duke Alexander Jagiellon, Queen Elizabeth of Austria, Barbara Radziwiłł, heart of the Grand Duke Władysław IV Vasa are buried. These crypts also have one of the oldest frescos in Lithuania, painted in the late 14th or early 15th century, and dating to the times of the Christianization of Lithuania.