Columbia subject headings:
Harvard subject headings:
Guidobaldo, da Montefeltro, Duke of Urbino, 1472-1508.
Italy--History--1492-1559.
Urbino (Italy)--Kings and rulers--Biography--Early works to 1800.
Princeton subject headings:
Guidobaldo, da Montefeltro, Duke of Urbino, 1472-1508.