Jallafillia was a planet in the Earth Empire. (PROSE: Original Sin) It was run by the Church of Saint Thoth.
When Chris Cwej was training with the Adjudicators, he did an off-world tour of duty and visited Jallafillia. (PROSE: Christmas on a Rational Planet)
In 2975, the Imperial fleet devastated the planet, bringing an end to an alien insurrection there. (PROSE: Original Sin)