prince Hnæf, was staying as an invited guest of the Frisian king Finn. For reasons unknown, a battle broke out between the two parties, probably started by the Frisian side, and Hnæf was killed. Hnæf's retainer Hengest took command, and the sides engaged in a peace treaty; but Hengest and the Danes later avenged Hnæf's death and slaughtered the Frisians. An early historical king is Audulf, who minted coins dated to the first third of the 7th century. The Frisians consisted of tribes with loose bonds, centered on war bands but without great power. In the second half of the 7th century the Frisian kingship reached its maximum geographic development with its center of power in Dorestad. Social classes The earliest Frisian records name four social classes, the (nobiles in Latin documents) and , who together made up the "Free Frisians" who might bring suit at court, and the laten or liten with the slaves, who were absorbed into the laten during the Early Middle Ages, as slavery was not so much formally abolished, as evaporated. The laten were tenants of lands they did not own and might be tied to it in the manner of serfs, but in later times might buy their freedom. History of wars The exact title of the Frisian rulers depends on the source. Frankish sources tend to call them dukes; other sources often call them kings. Only three Frisian rulers are named in contemporary written sources. Aldgisl Under the rule of the king Aldgisl, the Frisians came in conflict with the Frankish mayor of the palace Ebroin, over the old Roman border fortifications. Aldgisl could keep the Franks at a distance with his army. In 678 he welcomed the English bishop Wilfrid, who, like him, was not a friend of the Franks. While Wilfrid was at Aldegisel's court, Ebroin offered Aldegisel a bushel of gold coins in return for Wilfrid, alive or dead. Aldegisel himself is said to have torn up and burned the letter from the Frankish mayor in front of the ambassadors and his household. It has been surmised by some that Aldegisel's kindness to Wilfrid was a mode of defiance of Frankish domination. During his stay, Wilfrid attempted to convert the Frisians, who were still pagan at that time. Wilfrid's biographer says that most of the nobles converted, but the success was short-lived. Redbad In 680, Aldgisl died and was succeeded