https://orthodoxchristiantheology.com/2024/11/29/pope-leo-iii-defender-of-the-filioque/ The only problem? The Letter 15, as far as I can tell, is not found i...

https://orthodoxchristiantheology.com/2024/11/29/pope-leo-iii-defender-of-the-filioque/ The only problem? The Letter 15, as far as I can tell, is not found i...