
One of his names arises because the orbit of the comet Swift-Tuttle (which goes around the Sun every 133 years) passes near the Earth and its radiant is in the constellation Perseus. (See the gallery here 'superluna' 2014 portrayed from several parts of the world)
The other name is the tribute paid in countries like Spain, the deacon St. Lawrence, who died on August 10.
Although the two phenomena occur with some frequency, the extraordinary is that coincide in one night.