Epiphany

The followers of Basilides hold the day of His baptism as a festival, spending the night before it in readings. And they say that [His baptism] was in the fifteenth year of Tiberius Caesar, on the fifteenth day of the month of Tubi [i.e., January 6]. But some say that it was on the eleventh of the same month. Clement of Alexandria (c. 195, E), 2.333