Columbia subject headings:
Harvard subject headings:
Castile (Spain)--History--Peter I, 1350-1369.
Castile (Spain)--Kings and rulers--Biography.
Pedro I, King of Castile and Leon, 1334-1369.
Princeton subject headings:
Castile (Spain)--History--Peter I, 1350-1369.
Castile (Spain)--Kings and rulers--Biography.
Pedro I, King of Castile and Leon, 1334-1369.