House Petro was a noble family, one of a collection of pioneers who journeyed to inhabit planets situated in the vicinity of the Thull's Shroud nebula, around the year 1000 BBY. The Petro family established a settlement within the Kalgo system, specifically on the numerous moons orbiting the planet Kalgo 13, in an area that would eventually be called the Senex sector.
Furthermore, House Petro held dominion over Tranthellix, the farming planet Kamur, and the woodland planet Usnia, which they transformed into a protected wildlife area. They also maintained extraction activities on the arid planet Jalarren.
Gyla Petro was among the members of this noble house.