- Portugal1
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- Reading1
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- Responsa1
- Roderick, King of the Visigoths, -711?1
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- Rufina, Saint, -approximately 2871
- Sancho Garcés I, King of Navarre, -9251
- Sancho IV, King of Castile and Leon, 1257-12951
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- Sententiarum libri IV (Peter Lombard, Bishop of Paris)1
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- Sepúlveda, Juan Ginés de, 1490-15731
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