Collect the information about the history of both. Social conditions, political subdivisions, The behaviour of the operating authority among them and other primary documents. Secondary and tertiary
Gather information about the history of the two peoples, socio political dominance. Behavioral practices of authority among them, and more. Both documents are primary, secondary and tertiary.
Gather information about the history of the two conditions, social political power to rule. Practice of authority among them behavior and so on. Both documented primary secondary and tertiary care.