early life and training willem bartel van der kooij, a renowned frisian dutch painter, was born in augustinusga, friesland, in 1768 into an affluent family. at the tender age of twelve, he began his apprenticeship with a local firm of painters and decorators, marking the inception of his artistic journey. under the guidance of carel jacob van baar van slangenburgh, a prominent frisian painter, van der kooij refined his skills, eventual…