Ludolph van Ceulen, German-Dutch mathematician and academic (d. 1610)

Ludolph van Ceulen (German: [fan ˈkɔʏlən], Dutch: [vɑŋˈkøːlə(n)]; 28 January 1540 – 31 December 1610) was a German-Dutch mathematician from Hildesheim. He emigrated to the Netherlands.