Which preposition to use with floralia

of Occurrences 2%

It is said that they are the floralia of the Romans.

in Occurrences 1%

Fourth: I invoke Robigus and Flora by whose influence the blight is kept from crop and tree, and in due season they bear fruit (for which reason is the annual festival of the robigalia celebrated in honour of Robigus, and that of the floralia in honour of Flora).

Which preposition to use with  floralia