One of the most notable buildings in Tonyrefail is Collenna House, a three-story mansion originally built in 1093, which overlooks the village. The house is believed to have been built by the Welsh noble, Einion ap Collwyn who after a dispute with Iestyn ab Gwrgant, married Iestyn's only daughter, Nest. The two are said to have set up home at Collenna House and it was around this time that they founded the old church of St. John.
One of the most prominent structures in Tonyrefail is Collenna House, a three-story manor originally constructed in 1093, which commands a view over the village. The house is thought to have been built by the Welsh aristocrat, Einion ap Collwyn who after a disagreement with Iestyn ab Gwrgant, married Iestyn's only child, Nest. The two are said to have established residence at Collenna House and it was around this time that they founded the ancient church of St. John.