Did you mean: Adriaan van Rooyen
Adriaan van Royen
Dutch botanist
Adriaan van Royen was a Dutch botanist. He was a professor at Leiden University and is associated with Carl Linnaeus.
He is best known for his work on flora of Southeast Asia. Wikipedia
Born: November 4, 1704, Netherlands
Died: February 28, 1779 (age 74 years), Leiden, Netherlands