Pope Saint Telesphorus was pope from about 126 to about 137. His pontificate began during the reign of the Roman Emperor Hadrian, during which he witnessed the persecution of Christians, and ended during the reign of Emperor Antoninus Pius. The Vatican's "Annuario Pontificio" says that he was Greek by birth, and reigned from 127 or 128 to 137 or 138. The tradition of Christmas midnight masses, the celebration of Easter on Sundays, … Wikipedia
The definitive Wikipedia entry for Pope Telesphorus Telesphorus. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Pope_Telesphorus