Three codes were hidden in THE TRUE SOURCE OF POWER AND MYSTERY post on the Investigate Ingress blog.
[1] virhitvarxvargvpfvirlgjbw
[2] xt6h6aepy3wrt2j
[3] 7920604680920600686885
Code #1
Observations
An old roman emperor will guide you
Code #2
Observations
15 characters with the right amount of numbers for a valid passcode
Code #3
Observations
Try to find the passcode format first