Information:  - Martin Martens ( December 8 , 1797 -- February 8 , 1863 ) was a Belgian botanist and chemist born in Maastricht , Netherlands . He studied medicine in Liege , afterwards serving as a physician in Maastricht from 1823 to 1835 . From 1835 to 1863 he was a professor of chemistry at the Catholic University of Louvain . With Henri Guillaume Galeotti ( 1814 - 1858 ) , he was the binomial author of many botanical species . In 1842 , with Galeotti , he published an important treatise on ferns of Mexico titled Memoire sur les Fougères du Mexique , et considérations sur la géographie botanique de cette contrée . With Galeotti , he was also co-author of works on the botanical families Gesneriaceae and Solanaceae . The mycological genera Martensiomyces and Martensella are named in his honor , the latter genus being circumscribed by Henri Eugène Lucien Gaëtan Coemans ( 1825 -- 1871 ) .  - The Netherlands  is the main constituent country of the Kingdom of the Netherlands. It is a densely populated country located in Western Europe with three island territories in the Caribbean. The European part of the Netherlands borders Germany to the east, Belgium to the south, and the North Sea to the northwest, sharing maritime borders with Belgium, the United Kingdom, and Germany. The largest cities in the Netherlands are Amsterdam, Rotterdam, The Hague and Utrecht. Amsterdam is the country's capital, while The Hague holds the Dutch seat of government and parliament. The name "Holland" is used to refer informally to the whole of the country of the Netherlands.  - Maastricht (Limburgish : "Mestreech" ; French: "Maestricht" ; Spanish: "Mastrique" ) is a town and a municipality in the southeast of the Netherlands. It is the capital city of the province of Limburg.    What entity does 'martin martens' has the relation 'languages spoken or written' with?
Answer:
french