A team of Czech and Brazilian experts studied the skulls of two early rulers of Bohemia in the 10th century, Premyslid princes Vratislaus I and Spytihnev I, and combined various methods that allowed to create digital reconstructions of their faces. The team has also been working on the faces of St. Ludmila, a princess from the Premyslid dynasty, the mother of the two princes and the first Czech saint, and her grandson St. Wenceslas, the holy patron of Czechs. In the past years, the team presented the reconstructed faces of Queen of Bohemia Judith of Thuringia from the 12th century and Zdislava Berka, a Czech saint of the Roman Catholic Church, living in the 13th century. The method of scientific studies of the skulls dates back to the 1970s when researchers started began studying the connection between the skull shape and the shape of the face. Eye color and shape and hair color are guided by historical sources and DNA analysis.