 Kings did not rule alone, but rather governed together with the leading churchmen and nobles.While Northumbria lacks the body of charters which shed light on the institutions of the southern Anglo-Saxon kingdoms, sufficient evidence survives for historians to reconstruct some aspects of Northumbrian political life.The evidence for Northumbria survives largely in Latin documents, and these use the words "dux" and "patricius" to describe the leading noblemen of the kingdom.