Delos IV was the inhabited fourth planet in its star system. Lieutenant Adele Simmons, a crewmember aboard both the USS Enterprise-D and USS Voyager, was born on this non-Federation planet.
In 2352, Beverly Crusher interned under Dr. Dalen Quaice on this planet. (TNG: "Remember Me")
In 2369, this planet was listed on the chart "USS Enterprise Personnel Database", which was seen on Jean-Luc Picard's PADD on aboard the Enterprise-D. (TNG: "The Chase", okudagram)
According to StarTrek.com, there were two systems named Delos and this Delos IV was not the same planet as Brekka.