Dal'yth is among the core worlds of the Tau Empire and was settled during the First Sphere Expansion, becoming the hub of trade and commerce for the Empire. As a result, a disproportionate number of Water Caste merchants dominate its culture. Despite its importance to the Tau Empire, Dal'yth has been endangered by invasion several times, most notably at the climax of the Damocles Gulf Crusade and is currently at risk due to the encroaching Orks fighting the War of Dakka.