King or Duke
What the exact title of the Frisian rulers was depends on the source. Frankish sources tend to call them dukes; other sources often call them kings.
Read more about this topic: Poppo (Frisian)
Famous quotes containing the words king and/or duke:
“Upon Saint Crispin’s day
Fought was this noble fray,
Which fame did not delay
To England to carry.
On when shall Englishmen
With such acts fill a pen,
Or England breed again
Such a King Harry?”
—Michael Drayton (1563–1631)
“Autumn in New York, why does it seem so inviting?”
—Vernon Duke (1903–1969)