Mezue ahịrịokwu na-esonụ: N'afọ 1463 ọ ghọrọ Admiral nke Flanders. Na 1476 ọ bụ onye otu Duchal Council nke Charles the Bold. Site na 1477 gaa n'ihu, ọ bụ onye chamberlain n'ụlọikpe nke ada Charles, Mary nke Burgundy. N'afọ 1478, e mere ya onye Knight nke Order of the Golden Fleece. Mgbe Wolfert nke Isii nke Borselen enweghịzi ike ịchịkwa ọnọdụ dị na Holland na Zeeland, a họpụtara Joost ịbụ onye na-achị steeti ndị a. Ọ nọgidere na-abụ stadtholder ruo mgbe ọ nwụrụ na 1483. Joost de Lalaing nwụrụ na nnọchibido nke Utrecht, n'oge
Agha Hook na Cod.