Trícha cét
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Background
Described as a "spatial unit of royal tenure, taxation, local government, and military levy", the trícha cét largely corresponded to a local petty kingdom ruled by a petty king.[3] A minority, however, were ruled by a taisaig (leader) or an airríg (governor), appointed by a superior kings.[3]
In the province of Ulster, a tríocha céad was subdivided into roughly twenty-eight baile biadhtaigh, meaning "lands of a food-provider", and around 463 seisrigh, meaning "six-horse plough-teams".[1]
During the eleventh century, the system became established across the island, a refinement on a pre-existing system.[3]