Angel I was the inhabited first planet in its star system. This remote planet was located close to the Romulan Neutral Zone. Angel I was a M-class planet and the homeworld of a humanoid species. The planet supported carbon-based flora and fauna and was sparsely populated with intelligent life. The planet had no platinum deposits. (TNG: "Angel One")
Angel I had evolved into a constitutional oligarchy that was governed by the Parliament, an elected matriarchy consisting of six Mistresses and an overall leader, called the Elected One. Society was established around the idea that males were second-class citizens. Women were the hunters and the soldiers. In 2364, the Elected One was Beata.
In 2357, the Federation freighter Odin collided with an asteroid near Angel I. After five months in rescue pods, the survivors of the Odin landed on the planet. Over the next seven years, the survivors took wives and had children. The influence of the survivors on Angel I exacerbated a situation that had been developing for years in that there were people who were dissenting with the majority view that males were second class citizens and were now calling for greater rights with men. The survivors had become symbols of this growing movement.
The USS Enterprise-D arrived in the system in 2364 on an investigation into the fate of the freighter. During the course of the investigation, the Odin survivors and their families were captured. The planetary legislature determined that this group had promoted heretical beliefs that were inconsistent with the beliefs of the ruling majority. The legislature ruled that the children were to be separated from their parents, and the parents were to be executed. After consultation with an away team from the starship, the legislature reversed its earlier position and ruled that the parents were not to be executed and were to be reunited with their children. However, this group was to be exiled to a remote and unpopulated region. (TNG: "Angel One")
- Cygnet XIV, another female-dominated planet
The matte painting used for the capital city was later reused for Starbase 515 ("Samaritan Snare"), a Malcorian city ("First Contact"), a Kriosian city ("The Mind's Eye"), Klaestron city ("Dax"), and a Banean city ("Ex Post Facto").
According to Star Trek: Star Charts (p. 66) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Angel (Alpha Gruis, Al Nair) system was located in the Beta Quadrant. This was a binary system with a pair of B-class stars.
According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 54), the remote and unpopulated region to which Ramsey and his followers were exiled to was named Mortania.