Joanna I of Naples
According to tradition, he lived in the 1370s in Italy and was knighted by Queen Joanna I of Naples for his military and court services. After the death of his father in 1376 Ocko returned to his homeland in 1378. After heavy fighting against Folkmar Allena, he initially united almost all of East Frisia under his rule. In 1389 he was murdered near the district of Aurich Castle.