Feast of the Triumph of Christ over the Devil?

In the now defunct Sarum Rite (Usage) of the Roman Rite one can find the title of this **Feast of the Triumph of Christ over the Devil** as celebrated on February 15th. This “historical” feast was extremely ancient and is only found in some of the more ancient Sarum Liturgical Calendars. It is now completely obsolete. Sadly enough, I can not find sources of this feast online. It existed on a few of the more ancient documents and Sarum Liturgical Calendars. I am guessing that with regards to the Sarum Liturgical Calendar some online sources state that the inclusion in liturgy calendars of several *"historical dates"* was quite common in the Middle Ages, such as the listing of the [Resurrection of Our Lord on March 27th](https://archive.org/details/cu31924092460033/page/n31/mode/2up?view=theater) . Given the fact, that historical Liturgical sources would be very difficult to non-existant about what this feast of the ***Triumph of Christ over the Devil*** actually celebrated like or what Gospel events it entailed, would anyone have any input or information on what the Sarum meant by he Triumph of Christ over the Devil. If no such information can be found, would anyone possibly have the liturgical inclination as to what the inspiration and meaning would be and why it would be placed on February 15th. As a side note, this question may be of help or interest to some: [Did the Annunciation and Good Friday coincide?](https://christianity.stackexchange.com/questions/47170/did-the-annunciation-and-good-friday-coincide) I would prefer a Canon or traditional type of answer. However, if no one can provide a response that is factually supported, one that is based liturgical principles and/or tradition Catholic logic will be acceptable.