Dutch historian and Historiographer. His main focus was Dutch history and the birth of the Dutch as a nation.
Geyl also was one of the first promoters of the "Greater-Netherlands" idea, which goal is a unification of the Netherlands and Flanders in one country.
During the second world war he was forbidden to publish and was interned for a couple of years.
It's great. I was looking for the quote I'd paraphrased to Quentin because I remembered it as moving and found it: 'England, which has on three occasions stood in the breach for the liberty of Europe - and the last time the most glorious.' I paraphrased that as Britain saved Europe three times and the last the best/greatest. By 'England' he meant Britain. I hope you think my paraphrase fair enough after thirty years from a first reading.