Which coastal region boasts a duke named Unno who speaks Frisian?
Unno: Unno was a duke from the medieval Frisian shire of Rüstringen. Frisia: Frisia (West Frisian: "Fryslân" ; Dutch: "Friesland" ) is a coastal region along the southeastern corner of the North Sea in what today is mostly a large part of the Netherlands, including modern Friesland, and smaller parts of northern Germany. Frisia:  Frisia is the traditional homeland of the Frisians, a Germanic people that speaks Frisian languages, which together with English and Scots form the Anglo-Frisian language group.
Frisia