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By Anonymous (not verified) , 7 August 2025

Omnibonus [late 12th cent.]

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By Anonymous (not verified) , 7 August 2025

Onosander [1st cent.]

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By Anonymous (not verified) , 7 August 2025

Opus ouorum

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By Anonymous (not verified) , 7 August 2025

Orderic Vitalis OSB [1075–c1143]

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By Anonymous (not verified) , 7 August 2025

Ordinaire des chrétiens

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By Anonymous (not verified) , 7 August 2025

Ordinale de usu ecclesiae Exoniensis, drawn up by John Grandisson

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By Anonymous (not verified) , 7 August 2025

Ordinarium canonicorum regularium S. Laudi Rothomagensis

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By Anonymous (not verified) , 7 August 2025

Oribasius [c320–c400]

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By Anonymous (not verified) , 7 August 2025

Origen [c185–c254]

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By Anonymous (not verified) , 7 August 2025

Orontius Fineus (Oronce Fine) [1494–1555]

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