Bernt Wilhelm Westermann (2 October 1781 in Copenhagen – 10 March 1868) was a wealthy Danish businessman who collected insects. He was based in Slotsholmsgade at the 1850 census (Bag Børsen No. 74, first floor). [1]
An amateur insect collector Westermann travelled to Calcutta (India) and later to Jakarta (Indonesia) as an employee of an English business firm.
At the Cape of Good Hope, in Bengal and Java he collected insects for English and Dutch friends, amongst others for Thomas Horsfield. In 1817 he returned to Copenhagen becoming a shipowner and owner of a sugar-refinery at Slotholmsgade in Copenhagen.
Insects from all orders acquired and collected during the rest of his life added to his Cape, Java and Bengal insects to form a notable collection. In all there were 45,000 species in beautiful condition. The collection can be admired today in the Royal Museum Collection in the University of Copenhagen.

Johan Christian Fabricius was a Danish zoologist, specialising in "Insecta", which at that time included all arthropods: insects, arachnids, crustaceans and others. He was a student of Carl Linnaeus, and is considered one of the most important entomologists of the 18th century, having named nearly 10,000 species of animals, and established the basis for the modern insect classification.
Martin H[e]inrich Carl Lichtenstein was a German physician, explorer, botanist and zoologist. He explored parts of southern Africa and collected natural history specimens extensively and many new species were described from his collections by European scientists.
The Danish East India Company refers to two separate Danish-Norwegian chartered companies. The first company operated between 1616 and 1650. The second company existed between 1670 and 1729, however, in 1730 it was re-founded as the Asiatic Company.
Nathaniel Wolff Wallich FRS FRSE was a surgeon and botanist of Danish origin who worked in India, initially in the Danish settlement near Calcutta and later for the Danish East India Company and the British East India Company. He was involved in the early development of the Calcutta Botanical Garden, describing many new plant species and developing a large herbarium collection which was distributed to collections in Europe. Several of the plants that he collected were named after him.

Johann Wilhelm Meigen was a German entomologist famous for his pioneering work on Diptera.
Westermann is a surname meaning "man from the West". Notable people with the surname include:
Christian Rudolph Wilhelm Wiedemann was a German physician, historian, naturalist and entomologist. He is best known for his studies of world Diptera, but he also studied Hymenoptera and Coleoptera, although far less expertly.
Pierre-Justin-Marie Macquart was a French entomologist specialising in the study of Diptera. He worked on world species as well as European and described many new species.
Ordrupgaard is a state-owned art museum situated near Jægersborg Dyrehave, north of Copenhagen, Denmark. The museum houses one of Northern Europe's most important collections of Danish and French art from the 19th and beginning of the 20th century.
John Nietner born Johannes Werner Theodor Nietner was a Prussian-born naturalist chiefly interested in botany and entomology. Born in Potsdam, he became a naturalized British citizen and owned a coffee plantation in Ceylon. During his stay in Ceylon from 1851 to 1874 he collected and described numerous insect species from the island. He also sent specimens for study by experts in Europe and many species such as Cethosia nietneri were named after him by others. Interested in insect pests, he wrote a booklet on the pests of coffee in 1861.
Karl Ludwig Philipp Zeyher, was a botanical and insect collector who collected extensively in South Africa. He was the author, with Christian Friedrich Ecklon, of Enumeratio Plantarum Africae Australis (1835-7), a descriptive catalogue of South African plants.
Christian Friedrich Ecklon was a Danish botanical collector and apothecary. Ecklon is especially known for being an avid collector and researcher of plants in South Africa.
Wilhelm Gueinzius was a German naturalist, collector and apothecary.
The Copenhagen Zoological Museum was a separate zoological museum in Copenhagen, Denmark. It is now a part of the Natural History Museum of Denmark, which is affiliated with the University of Copenhagen. The separate museum location closed in 2022, but will reopen in 2025 in new and considerably larger buildings in the northeastern corner of the Copenhagen Botanical Garden. Although the museum will be relocated, the research and storage facilities at its old location have been maintained.
Bernt is a Scandinavian variant of the German masculine given name Berend, which is the Low German form of Bernard (Bernhard). The name Bernhard means "strong bear". Its use in Sweden was first documented in 1395.
Events from the year 1868 in Denmark.
Events from the year 1781 in Denmark.
Frederik Adolph de Roepstorff was a Danish philologist who worked in the Andaman penal colony in India, where he was shot dead by a convict. He studied the languages of Andaman and Nicobar tribes and collected numerous natural history specimens. The Andaman masked owl was named after him by Hume.
Dagobert Carlvon Daldorff was a senior lieutenant in the Danish East India Company, naturalist and collector of natural history specimens. He is commemorated in the crab genus Daldorfia.