Columbia subject headings:
Christians--Mediterranean Region--History.
Ransom--Mediterranean Region--History.
Slavery and Islam--Mediterranean Region--History.
Slavery--Mediterranean Region--History.
Harvard subject headings:
Archivio vaticano
Christians--Mediterranean Region--History--16th century.
Slave records--Mediterranean Region--History--16th century.
Slavery and the church--Catholic Church--History--16th century.
Slavery--Mediterranean Region--History--16th century.
Princeton subject headings: