He gained military experience in the army of the Prince of Orange during the 1630s.

Altogether he served the Prince of Orange for five years, without receiving pay.

Confirmation swiftly followed in another message from the Prince of Orange.

He is also said to have been physician to the Prince of Orange of the time.

The Prince of Orange having come over at this time, the opposition leaders were open to a compromise on the exclusion question.

His young daughter was betrothed to the Prince of Orange.

The Prince of Orange and his friends knew that, perfectly well, and desired nothing more.

The Prince of Orange, however, was determined to relieve the city.

William was also known as the Prince of Orange.

Their father, the Prince of Orange, thought the physical education of the boys particularly important.