Date of Birth: 
About Wilhelm Nicolaysen
- Wilhelm Lorentz Lexau Nicolaysen (16 February 1869 – 22 July 1944) was a Norwegian barrister and businessperson. He was born in Kristiania as a son of professor of medicine Julius Nicolaysen (1831–1909) and Bolette Marie Berentine Nicolaysen (1835–1922).
- He was a brother of professor of medicine Johan Nicolaysen and banker Lyder Wenzel Nicolaysen, uncle of chief physician Knud Dahl Nicolaysen, nephew of Nicolay Nicolaysen and second cousin of Niels Aars Nicolaysen.
- In 1919 he married Fredrikke Dorothea Hagerup, daughter of Prime Minister Francis Hagerup and since 1919 a court mistress for the Norwegian royal family.He finished his secondary education in 1887, graduated with the cand.jur.
- degree in 1893 and started working as an attorney; later barrister.
- He started his own law firm in 1895, was a partner with H.
- Schjoldager between 1911 and 1919 before continuing on his own again.He co-founded of the company De-No-Fa in 1912, and served as board chairman for decades.
- From 1931 to 1934 he was also a board member of Lilleborg Fabriker.
- He died in July 1944, followed by his wife in June 1946.
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