Kedron, or Cerdo, served as Patriarch of Alexandria
during the reign of the emperor Trajan. According to
the Church historian Eusebius, he was the third
bishop to occupy the see. However, if Saint Mark is
considered to be the first, then Kedron would in
fact be the fourth. He presided between 99 and 110.
He was one of the people baptised by Saint Mark in
Alexandria and was marytered on 21 Paoni, 15 June
106 AD.  He is commemorated in the Coptic
Synaxarion on the 21st day of Ba'unah.