From Halopedia, the Halo wiki
Roost is a human colony situated in the Lambda Aurigae system. Then-Captain Preston Jeremiah Cole took the Heavy destroyer UNSC Gorgon to the system for a session shore leave. At least part of the planet featured tropical beaches and was known for its fishing.
It was here that Cole met and married Lyrenne Castilla. However, Castilla was revealed to be an Insurrectionist and the captain of the Bellicose, and fled the colony before she could be taken into custody.
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