Chairacha appointed his brother Prince Thianracha (later Maha Chakkrapat) as the Uparaja but did not grant him the title of King of Sukhothai as Chairacha was trying to unite the two kingdoms by reducing the power of Sukhothai nobles.
Chairacha appointed his brother Prince Thianracha (later Maha Chakkrapat) as the Uparaja but did not grant him the title of King of Sukhothai because he aimed to unite the two kingdoms by weakening the power of Sukhothai's nobility.