A star cluster where the nomadic Gatherers, exiles from Acamar III, kept their camps, searched by the Enterprise-D in The Vengeance Factor.
The Hromi Cluster is a group of star systems used as a refuge by the Gatherers, bands of raiders who left Acamar III about a century before the 2360s, when that world's clan feuds were brought to an end.
In the Next Generation episode The Vengeance Factor, set in 2366, Gatherer raids on Federation outposts lead Picard to offer his help in reconciling the two branches of the Acamarian people. The USS Enterprise-D carries the Acamarian leader, Sovereign Marouk, into the cluster, and an away team finds a Gatherer camp on Gamma Hromi II.
Talks with the Gatherer leader Chorgan follow, but they are endangered by Marouk's servant Yuta, the last of the Tralesta clan, who has been altered to carry on a blood feud by killing members of the rival Lornak clan.