Sixtus of Rome
Sixtus follows Alexander in Irenaeus's Roman list.
Primary sources
Irenaeus writes:
Irenaeus counts Sixtus sixth from the apostles after Alexander.
Alexander followed Evaristus; then, sixth from the apostles, Sixtus was appointed; after him, Telephorus, who was gloriously martyred; then Hyginus; after him, Pius; then after him, Anicetus. Soter having succeeded Anicetus, Eleutherius does now, in the twelfth place from the apostles, hold the inheritance of the episcopate.
Passage context and translation
The list follows Irenaeus's statement that Evaristus succeeded Clement. It is a late second-century office sequence used to argue for public teaching, not a record naming each ordaining bishop.
Before the excerpt
To this Clement there succeeded Evaristus.
After the excerpt
In this order, and by this succession, the ecclesiastical tradition from the apostles ... have come down to us.