In the EF today, the feast of St. Ursula and her companions is also commemorated. The following notes are taken from the St. Andrew Daily Missal (1962 Edition).
"To-day's feast celebrates a group of virgins martyred at Cologne at the end of the third or the beginning of the fourth century. - The legend of St. Ursula's 11.000 companions, killed at Cologne by the Huns, was very popular in the Middle Ages. Probably an inscription: "undecim M. Virg." meaning: "undecim Martyres Virgines", was interpreted as "undecim Milia Virgines".
Orate pro nobis.