From Stamps of the World
Groningen is the main municipality as well as the capital city of the eponymous province in the Netherlands. With a population of 198,108 (in 2014), it is the largest city in the north of the Netherlands. An old city, Groningen was the regional power of the northern Netherlands, a semi-independent city-state and member of the German Hanseatic League. Groningen is a university city: the University of Groningen (about 28,000 students) and Hanze University of Applied Sciences (about 25,000 students).
Read more @ http://en.wikipedia.org/wiki/Groningen