Tienen (ˈtinə(n); Tirlemont tiʁləmɔ̃) is a city and municipality in the province of Flemish Brabant, in Flanders, Belgium. The municipality comprises Tienen itself and the towns of Bost, Goetsenhoven, Hakendover, Kumtich, Oorbeek, Oplinter, Sint-Margriete-Houtem and Vissenaken.
On 1 January 2017, Tienen had a total population of 34,365. The total area is which gives a population density of .
In the early Middle Ages, the town was probably ruled by an old German family Thienen.
During the 1635 to 1659 Franco-Spanish War, Tienen was part of the Spanish Netherlands and was captured by a combined Franco-Dutch army in May 1635. Its capture resulted in one of the most serious atrocities of the Dutch Revolt; the town was sacked, over 200 civilians killed and many buildings damaged, including Catholic churches and monasteries. This ended Dutch prospects of winning over the predominantly Catholic population of the Southern Netherlands.
After the 1714 Treaty of Utrecht, t