25. November is the feast day of: Catherine of Alexandria (d. ca. 305, supposedly). The virgin martyr C.'s historicity is very poorly attested. Here is a English-language site on the monastery dedicated to her on the Sinai peninsula in Egypt (whither her body is said to have been miraculously transported and where her veneration is unmentioned in any of the surviving late antique pilgrim accounts):
A virgin and martyr whose feast is celebrated in the Latin Church and in the various Oriental churches on 25 November, and who for almost six centuries was the object of a very popular devotion.
Below is from the catholic online encyclopedia
Of noble birth and learned in the sciences, when only eighteen years old, Catherine presented herself to the Emperor Maximinus who was violently persecuting the Christians, upbraided him for his cruelty and endeavoured to prove how iniquitous was the worship of false gods. Astounded at the young girl's audacity, but incompetent to vie with her in point of learning the tyrant detained her in his palace and summoned numerous scholars whom he commanded to use all their skill in specious reasoning that thereby Catherine might be led to apostatize. But she emerged from the debate victorious. Several of her adversaries, conquered by her eloquence, declared themselves Christians and were at once put to death. Furious at being baffled, Maximinus had Catherine scourged and then imprisoned. Meanwhile the empress, eager to see so extraordinary a young woman, went with Porphyry, the head of the troops, to visit her in her dungeon, when they in turn yielded to Catherine's exhortations, believed, were baptized, and immediately won the martyr's crown. Soon afterwards the saint, who far from forsaking her Faith, effected so many conversions, was condemned to die on the wheel, but, at her touch, this instrument of torture was miraculously destroyed. The emperor, enraged beyond control, then had her beheaded and angels carried her body to Mount Sinai where later a church and monastery were built in her honour.