**Adriaan van Roomen** (29 September 1561 – 4 May 1615), also known as **Adrianus Romanus**, was a "Flemish "mathematician.

Van Roomen was born in "Leuven, the son of Adriaan Van Roomen and Maria Van Den Daele. He became a professor, and then travelled extensively in "Europe.

After studying at the Jesuit College in "Cologne, Roomen studied medicine at "Leuven. Roomen was professor of mathematics and medicine at Louvain from 1586 to 1592, he then went to "Würzburg where again he was professor of medicine and became "Mathematician to the Chapter". He met "Kepler, and discussed with "François Viète two questions about equations and tangencies. He then spent some time in "Italy, particularly with "Clavius in "Rome in 1585.

He was ordained a "priest in 1604. After 1610 he tutored mathematics in "Poland.

He worked in "algebra, "trigonometry and "geometry; and on the "decimal expansion of "π.

His publication of 1595, *Parvum theatrum urbium*, contained Latin verse on the cities of Italy (possibly written by "Thomas Edwards).^{[1]}

He solved the "Problem of Apollonius using a new method that involved intersecting hyperbolas.

*Ideae mathematicae pars prima, sive methodus polygonorum*. 1593. digital*Parvvm Theatrvm Vrbivm siue Vrbivm Praecipvarvm Totivs Orbis Brevis & methodica Descriptio*. - Francofvrti : Bassaeus, 1608. digital

**^**Matthew Steggle, ‘Edwards, Thomas ("fl. 1587–1595)’, "Oxford Dictionary of National Biography, Oxford University Press, 2004

- "O'Connor, John J.; "Robertson, Edmund F., "Adriaan van Roomen",
*"MacTutor History of Mathematics archive*, "University of St Andrews. - "" Media related to Adriaan van Roomen (mathematician) at Wikimedia Commons