Columbia subject headings:
Feudalism--Spain--Castile--History.
Land tenure--Spain--Castile--History.
Primogeniture--Spain--Castile--History.
Harvard subject headings:
Feudalism--Spain--Castile--History.
Feudalism--Spain--Castile.
Land tenure--Spain--Castile--History.
Land tenure--Spain--Castile.
Primogeniture--Spain--Castile--History.
Primogeniture--Spain.
Princeton subject headings:
Feudalism--Spain--Castile--History.
Land tenure--Spain--Castile--History.
Primogeniture--Spain--Castile--History.