http://en.wikipedia.org/wiki/Nikolai_Vavilov

"While developing his theory on the centres of origin of cultivated plants, Vavilov organized a series of botanical-agronomic expeditions, collected seeds from every corner of the globe, and created in Leningrad the world's largest collection of plant seeds. This seedbank was diligently preserved even throughout the 28-month Siege of Leningrad, despite starvation; one of Nikolai's assistants starved to death surrounded by edible seeds."