Analysis of information sources in references of the Wikipedia article "Dymphna" in English language version.
Praedicta autem corporis venerandae virginis translatio facta est decimaquinta die Maij, quo eius festum celebratur. Decollata verò fuit eiusdem mensis die tricesimo.[Now the aforementioned transfer of the virgin's venerated body was carried out on the 15th day of May, on which her feast is celebrated. Her beheading had actually occurred within May as well, on the 30th day.]
[T]he feast of the Decollation [i.e. Beheading] of St. Dympna, with a solemn office, occurs on the 30th of May. [...] In the Utrecht [manuscripts], [...] it is stated, that her decollation took place, on the [...] 30th of May. The same statement is found, in the printed Legend of her Life, and in Surius.
May 30 is the day of her death, and May 15 that of her translation.
