Poppo (Frisian)
Poppo (674–734), also known as Bubo or Bobba, was a king (or duke) of Frisia from the 8th century. After Aldgisl and Radboud he is the third Frisian ruler mentioned in the literature. He is possibly the last Frisian king. However Adgillis II, possibly Poppo's brother also ruled during the same period but no contemporary accounts of his rule exist.
Read more about Poppo (Frisian): King or Duke, History