Wilhelm Lorentz Lexau Nicolaysen (16 February 1869 – 22 July 1944) was a Norwegian barrister and businessperson.
He was born in Kristiania[1] 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.[2] [3] In 1919 he married Fredrikke Dorothea Hagerup,[4] daughter of Prime Minister Francis Hagerup and since 1919 a court mistress for the Norwegian royal family.[5]
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.[1]
He co-founded of the company De-No-Fa in 1912,[6] and served as board chairman for decades. From 1931 to 1934 he was also a board member of Lilleborg Fabriker.[1] He died in July 1944, followed by his wife in June 1946.[7]