The Burgundian kingdom is one of the early Germanic kingdoms that existed within the Roman Empire. In the late fifth and early sixth centuries, the Burgundian kings Gundobad and Sigismund compiled and codified laws to govern the members of their Barbarian tribe, as well as Romans living amongst them. Those laws governing the Burgundians themselves are called collectively the "Lex Burgundionum", while the laws governing the Romans are known collectively as the "Lex Romana Burgundionum". Both are extant. The laws codified in the Burgundian Code reflect the earliest fusion of German tribal culture with the Roman system of government. It promoted and helped maintain harmonious relations between such widely different people who had been previous enemies. More devotion has been given to other Germanic tribes of this time and little is known about the culture and way of life of the Burgundians beyond what can be inferred from their legal code. Dr. Katherine Fischer Drew claims that it is the most influential of all barbarian law codes because of its survival, even after Frankish conquest, until the ninth century.