Siam

Itsaraphab: Grants a Diplomatic Action to immediately become Suzerain of a City-State at a higher Diplomacy Cost than Befriending Independents.

Chang Beun: Unique Ranged Unit. Has increased Movement and Combat Strength. Can move after attacking.

Uparat: Unique Great Person Unit. Can only be built once you are Suzerain of at least one City-State, and the specific Uparat received is random. Each Uparat can only be received once. Cost increases per Uparat built.

Doi Suthep: Influence Base. Increased Culture and Gold for each City-State of which you are Suzerain. Must be built on a Rough tile.

Bang: Unique Improvement. Culture and Happiness base. Must be placed on a Navigable River.

Cultural

Diplomatic

Ivory