Mathematician:Jacob Marcelis

Mathematician
Gave an approximation to $\pi$ (pi): $3 + \dfrac {1 \, 008 \, 449 \, 087 \, 377 \, 541 \, 679 \, 894 \, 282 \, 184 \, 894} {6 \, 997 \, 183 \, 637 \, 540 \, 819 \, 440 \, 035 \, 239 \, 271 \, 702}$ which he mistakenly claimed was exact.