1) Ancient Roman festival 
The Serapia or Sarapia was a Roman Imperial religious festival devoted to the Greco-Egyptian god Serapis. It is found as an official holiday on April 25 as late as the Calendar of Filocalus in 354 AD. In farmers` almanacs (menologia rustica) dating to the first half of the 1st century, the day was a sacrum or rite for Serapis along with Isis Phar....