Medemblik was a prosperous trading town, when in 1282, Floris V, Count of Holland, successfully invaded West Friesland. He built several fortresses to control the region, one of which was Kasteel Radboud in Medemblik, and awarded Medemblik city rights in 1289. After Floris V had been murdered in 1296, the local Frisian besieged the castle, but in 1297 an army from Holland thwarted their efforts to starve out the inhabitants, which included Medemblik citizens.
Medemblik obtained town walls in 1572, so that the castle lost its roll as a refuge for the citizens, which led to its partially dismantling in 1578.
Medemblik is best known in Europe for its sailing events. A good place to stay with your yacht.