To play as these specific leaders, you must own the Byzantium & Gaul Pack (for Theodora) and the Rise and Fall expansion (for Sejong).

Holy Sites provide Culture equal to their adjacency bonus.

When you complete your first Technology from a new era, you gain Culture equal to twice your Science per turn.

This ability helps scientific powerhouses maintain pace in Culture, preventing them from falling behind in Civics while pursuing a Science Victory. How to Access

Farms provide a +1 Faith adjacency bonus to both Holy Sites and Hippodromes.