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:
“I would not like a king who could obey.”
—Pierre Corneille (1606–1684)
“That very knowing,
Overflowing,
Easygoing
Paladin,
The Duke of Plaza-Toro!”
—Sir William Schwenck Gilbert (1836–1911)