A Cardassian military rank held by officers who command a warship, a station or an occupied territory, broadly matching a Starfleet captain and borne by Dukat, Madred, Evek and many others.
Gul is the rank of a commanding officer in the Cardassian military. A gul may command a single warship, a larger formation known as an order, a space station or a whole occupied world. The rank stands above glinn and below legate.
The title is first heard in The Next Generation episode The Wounded, in which Gul Macet travels aboard the Enterprise-D. Gul Madred interrogates Picard in Chain of Command, and Gul Evek appears in The Next Generation, Deep Space Nine and Voyager.
The most famous holder is Gul Dukat, the last prefect of Bajor and commander of Terok Nor. Cardassians are normally addressed by rank and family name, so the title became almost part of his name and he kept it even when he ruled Cardassia.