What's the use of cultural acceptance of King of Crusaders 3?

Culture represents the language and customs of the role or count, and the roles of different cultures will have low affection for each other. Every culture belongs to a larger cultural group, and the cultures in the same group are considered to be closer to each other than those outside the group. The more similar cultures there are in a ruler's territory, the greater his influence. Cultural leaders can influence which innovations should be discovered first by setting cultural preferences.