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In page Prince of Transylvania:

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The integration of Transylvania into the newly established Kingdom of Hungary began around 1003.[1][2] The province became subject to intensive colonization,[3] leading to the arrival and settlement of colonists of diverse origin, including the Hungarian-speaking Székelys and the Ethnic Germans.[4] The territory of Transylvania was divided for administrative purposes into territorial units called "counties" and "seats".[5]