Dom Martinus Dom, was a Belgian Trappist monk, and served as the first abbot of the Trappist Abbey of Westmalle, where he founded the Westmalle Brewery, in which country?
Belgium
Westmalle Brewery
Westmalle Brewery (Brouwerij der Trappisten van Westmalle) is a Trappist brewery in the Westmalle Abbey, Belgium.
 It produces three beers, designated as Trappist beer by the International Trappist Association.
 Westmalle Tripel is credited with being the first golden strong pale ale to use the term Tripel.
Martinus Dom
Dom Martinus Dom, O.C.R., (24 December 1791 – 9 December 1873) was a Belgian Trappist monk.
 He served as the first abbot of the Trappist Abbey of Westmalle, where he founded the Westmalle Brewery.
Westmalle Abbey
The Trappist Abbey of Westmalle, or Abdij van Onze-Lieve-Vrouw van het Heilig Hart (Abbey of Our Lady of the Sacred Heart) is a Cistercians of Strict Observance abbey in Westmalle in the Belgian province of Antwerp. Achel Abbey
The Trappist Abbey of Achel or Saint Benedictus-Abbey or also Achelse Kluis (which means hermitage of Achel), which belongs to the Cistercians of Strict Observance, is located in Achel in the Campine region of the province of Limburg (Flanders, Belgium).
 The abbey is famous for its spiritual life and its brewery, which is one of few Trappist beer breweries in the world.
 Life in the abbey is characterised by prayer, reading and manual work, the three basic elements of Trappist life. Achel Brewery
Achel Brewery or Brouwerij der Sint-Benedictusabdij de Achelse Kluis is a Belgian Trappist brewery, and the smallest of the Belgian Trappist breweries.
 It is located in the Abbey of Saint Benedict in the Belgian municipality of Hamont-Achel.
 It brews five Trappist beers. Rochefort Abbey
The Trappist Abbey of Rochefort or Abbey of Notre-Dame de Saint-Rémy, which belongs to the Cistercians of Strict Observance, is located in Rochefort in the province of Namur (Wallonia, Belgium).
 The abbey is famous for its spiritual life and its brewery, which is one of few Trappist beer breweries in the world.
 Life in the abbey is characterised by prayer, reading and manual work, the three basic elements of Trappist life.
 The motto of the abbey is "Curvata Resurgo". Tripel
Tripel is a term used by brewers or people mainly in the Low Countries, some other European countries, and the U.S. to describe a strong pale ale, loosely in the style of "Westmalle Tripel".
 The origin of the term is unknown, though the main theory is that it indicates strength in some way.
 It was used in 1956 by the Trappist brewery, Westmalle, to rename the strongest beer in their range, though both the term Tripel and the style of beer associated with the name (strong pale ale), were in existence before 1956.
 The style of Westmalle's "Tripel" and the name was widely copied by the breweries of Belgium, and in 1987 another Trappist brewery, the Koningshoeven in the Netherlands, expanded their range with a beer called "La Trappe Tripel", though they also produced a stronger beer they termed "La Trappe Quadrupel".
 The term spread to the U.S. and other countries, and is applied by a range of secular brewers to a strong pale ale in the style of "Westmalle Tripel". Dubbel
The term dubbel (also double) is a Belgian Trappist beer naming convention.
 The origin of the dubbel was a strong version of a brown beer brewed in Westmalle Abbey in 1856, which is known to have been on sale to the public by June 1861.
 In 1926, the recipe was changed, and it was sold as "Dubbel Bruin".
 Following World War Two, abbey beers became popular in Belgium and the name "dubbel" was used by several breweries for commercial purposes. Zundert (beer)
Zundert (] ) is a Trappist beer produced by De Kievit Trappist Brewery, part of the Trappist abbey Maria Toevlucht, from the town of Zundert in the Netherlands. Mariastern Abbey, Banja Luka
Mariastern Abbey () is Trappist abbey in Bosnia and Herzegovina, situated near the country's second largest city Banja Luka.
 It consists of the Church of the Assumption of the Blessed Virgin Mary and the monastery of Trappist monks.
 It is the only Trappist monastery in Southeastern Europe.
 At the beginning of the 20th century, with 219 monks, the Abbey was the largest Trappist abbey in the world; today it is the smallest, with only two monks.