Why Pierre de Fermat is the patron saint of unfinished business

http://www.csmonitor.com/Science/2011/0817/Why-Pierre-de-Fermat-is-the-patron-saint-of-unfinished-business
(CSMonitor.com) "Fermat's Last Theorem, jotted in the margins of an ancient Greek mathematical text by Pierre de Fermat in 1637, vexed mathematicians for 358 years before it was solved. "