CASTELLA (CASTELLAU), a hamlet, in the parish of LLANTRISSENT, hundred of MISKIN, county of GLAMORGAN, SOUTH WALES, 2 miles (N.) from Llantrissent, with which the population is returned. This hamlet contains some coal-works, part of the produce of which is shipped for Ireland. Here is a neat mansion, anciently the seat of the Trahearne family, now the property and residence of Major Smith, the grounds of which, being disposed with great taste, impart an air of cheerfulness and beauty to a scene naturally grand.