When did the process occur that occurred after the futhorc runes are thought to have been developed, resulting in the Anglo-Saxon runes to also being called the Anglo-Frisian runes?
Anglo-Saxon runes Anglo-Saxon runes are runes used by the early Anglo-Saxons as an alphabet in their writing. The characters are known collectively as the futhorc (or "fuþorc"), from the Old English sound values of the first six runes. The futhorc was a development from the 24-character Elder Futhark. Since the futhorc runes are thought to have first been used in Frisia before the Anglo-Saxon settlement of Britain, they have also been called Anglo-Frisian runes. They were likely used from the 5th century onward, recording Old English and Old Frisian.
Earl An earl is a member of the nobility. The title is Anglo-Saxon in origin, akin to the Scandinavian form jarl, and meant "chieftain", particularly a chieftain set to rule a territory in a king's stead. In Scandinavia, it became obsolete in the Middle Ages and was replaced by duke ("hertig"/"hertug"/"hertog"). In later medieval Britain, it became the equivalent of the continental count (in England in the earlier period, it was more akin to a duke; in Scotland it assimilated the concept of mormaer). However, earlier in Scandinavia, "jarl" could also mean a sovereign prince. For example, the rulers of several of the petty kingdoms of Norway had the title of "jarl" and in many cases they had no less power than their neighbours who had the title of king. Alternative names for the rank equivalent to "Earl/Count" in the nobility structure are used in other countries, such as the "hakushaku" of the post-restoration Japanese Imperial era.