Frisian kingdom
... that the Frisian kingdom came to an end after their king was killed in the Battle of the Boarn where they were defeated by the Frankish Empire?
... that the <b id="mwBJw"><a class="mw-redirect" href="./Frisian_kingdom" id="mwBJ0" rel="mw:WikiLink" title="Frisian kingdom">Frisian kingdom</a></b> came to an end after their king was killed in the <a href="./Battle_of_the_Boarn" id="mwBJ4" rel="mw:WikiLink" title="Battle of the Boarn">Battle of the Boarn</a> where they  were defeated by the <a href="./Carolingian_Empire" id="mwBJ8" rel="mw:WikiLink" title="Carolingian Empire">Frankish Empire</a>?