The Sudarium of Oviedo: Its History and Relationship to the Shroud of Turin
https://www.shroud.com/guscin.htm
The Sudarium of Oviedo: The “Other Shroud” of Jesus
The Sudarium is displayed in Oviedo three times each year: on Good Friday, on the Feast of the Triumph of the Cross (Sept. 14), and on the octave of the feast (Sept. 21).
https://www.ncregister.com/blog/the-sudarium-of-oviedo-the-other-shroud-of-jesus
https://en.wikipedia.org/wiki/Sudarium_of_Oviedo