FORCHAMMAN (FORCH-AMAN), a hamlet, in the parish of ABERDARE, within the limits of the new borough of MERTHYR-TYDVIL, county of GLAMORGAN, SOUTH WALES, 6 miles (S. W. by S.) from Merthyr- Tydvil. The population is returned with the parish. This hamlet takes its name from the Amman stream, which here falls into the river Cynon, on the right bank of which it is situated. The population is almost exclusively agricultural. Aberhaman House is a pleasing mansion, surrounded by well- grown trees, and seated in a vale between the road leading to Aberdare and the river Cynon: it was for centuries the seat of the family of Matthews, and was sold by a descendant to the late Anthony Bacon,;Esq., of Benham, in the county of Berks.