Before serving as
Archbishop of Utrecht, van Os served as grand vicar of the
Archbishop of Utrecht. After the death of Archbishop
Johannes Jacobus van Rhijn, King
Louis Bonaparte forbade the Chapter of Utrecht to elect a successor. After Louis’ resignation in 1810, the kingdom was annexed to the French Empire, and his brother,
Napoleon, visited
Utrecht in 1811. According to C.B. Moss, van Os met
Napoleon and resisted the emperor’s plan to confiscate the revenues of the Church. Neale writes: “He boldly and resolutely withstood the man to whose iron will
Pius VII had yielded.” ==
Archbishop of Utrecht==