Icnopilli

Icnopilli was a senior member of the ixtilque who was involved in attempting to stop Huemac from taking Atonal into service. He later greeted Gedarra and Primo de la Vega as they arrived in the past. He was purported to have visited a number of the heavens and the town of Ayahueltlan. (PROSE: Against Nature)

Behind the scenes
In an earlier draft of the story, Icnopilli and Momacami seemed to be one and the same and they were originally supposed to be a member of Faction Paradox who had their history rewritten in some sense.

Ayahueltlan translates roughly to "impossible place".