Sicko Sjaerdema

Sikke Sjaardema (died 1260), alternatively spelled Sikko or Sicka, was the eighth potestaat of Friesland, a province of the Netherlands.

Sjaerdema came from Ylst or IJlst (Elostoe in Latin) and was elected to Potestaat by the men of Friesland in 1237.

Count William II of Holland offered Sicko regional rule on the Friesian lands.

[1] Around the year 1250, Sjaardema made IJlst the province's capital where municipal laws were judged.

Abel, the "King of Norway" fell in East Friesland.