Columbia subject headings:
Architecture, Early Christian--Portugal.
Architecture, Early Christian--Spain.
Basilicas--Portugal.
Basilicas--Spain.
Basilicas.
Church architecture--Portugal.
Church architecture--Spain.
Portugal--Antiquities.
Harvard subject headings:
Basilicas.
Christian antiquities.
Church architecture--Portugal.
Church architecture--Spain.
Princeton subject headings:
Basilicas--Portugal.
Basilicas--Spain.
Liturgy and architecture.