Leiden
Leiden is a city and municipality in the province of South Holland, Netherlands.
Leiden University Medical Center.
Factor V Leiden is named after the Dutch city Leiden, where it was first identified in 1994 by Prof R. Bertina et al 1).
1)
Bertina RM, Koeleman BP, Koster T, et al. (May 1994). “Mutation in blood coagulation factor V associated with resistance to activated protein C”. Nature. 369 (6475): 64–7. doi:10.1038/369064a0. PMID 8164741