Of these, the Fordicidia and Robigalia are likely to have been of greatest antiquity.
The Robigalia of April 25 required the sacrificial offering of blood and entrails from a puppy, and perhaps also the entrails of a sheep.
It was held on 25 April, on which day the heathens had celebrated the festival of Robigalia, the principal feature of which was a procession.
Dog sacrifices were carried out in Rome also for the Robigalia, a state priests, was a moveable feast in response to the rising of the Dogstar, Sirius.
The beginnings of the major rogation can be traced to the Roman holiday of Robigalia, at which a dog was sacrificed to propitiate Robigus, the god of agricultural disease.
For the fungi, an account was provided by R . W . G . Dennis which has been digitized and the records made available on-line as part of the Cybertruffle Robigalia database.
The " litania major ", or great procession on St Mark's day ( April 25 ) is shown to coincide both in date and ritual with the Roman Robigalia, which took place ad . vii.
Several other festivals pertaining to farm life were held in April : the Parilia, a feast of shepherds, on April 21; the Robigalia on April 25, to protect crops from blight; at the end of the month.
The Robigalia was one of several agricultural festivals in April to celebrate and vitalize the growing season, but the darker sacrificial elements of these occasions are also fraught with anxiety about crop failure and the dependence on divine favor to avert it.