From Project: Redcap
The coloniae (singular colona) are young magi from other tribunals and Houses given permission by House Tremere to settle certain wilderness or frontier areas within the Transylvanian Tribunal to further the Houses' interests. They are granted limited rights, and are all nominally members of the covenant of Asclepius that has not existed for centuries. In reality they live in various oppida. They are detailed in Against the Dark 15.