| Famuli vestrae pietatis Latin for 'Servants of your piety' Letter of Pope Gelasius I | |
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| Signature date | 494 |
| Subject | Relations between the Catholic Church and the state |
| Part of a series on |
| Integralism |
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Famuli vestrae pietatis, also known by the Latin mnemonic duo sunt ('there are two'), is a letter written in 494 by Pope Gelasius I to Byzantine Emperor Anastasius I Dicorus on the relationship between religious and secular officials.