Question: Which coastal region boasts a duke named Unno who speaks Frisian?
Sentence (from "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.
Relevant evidence: Yes