Board Thread:Lore Discussion/@comment-1687225-20140423145647/@comment-98.100.96.154-20141201194926

It is also very likely that the Old Knights are a splinter group of Royal Sentinels, due to their similar size, attack strategy, and looks. Maybe they switched to stone armor because it was all they had access to at the time, and they didn't want to wear the old metal uniform of Anor Londo. They probably hollowed over the centuries between Heide's founding and when we found them, explaining why they are quite weak compared to the Anor Londo counterparts.