The Dried Blood of St Januarius (AKA San Gennaro) He is the patron saint of Naples. At the church named for him, the dried blood of Saint Januarius (…
Januarius/Gennaro
Additionally, to being the patron saint of Naples, he is the patron saint of Blood Banks/Blood Donors. His dried blood liquefies three times a year: the 1st Sunday in May, his liturgical feast day, and on the anniversary of the eruption of Mount Vesuvius. The National Catholic Register has a wonderful article besides this one which is a wonderful read.
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