Y Rhiw () is a small village on the south west tip of the Llŷn Peninsula in Gwynedd in Wales. From the village there are fine views towards Snowdonia and nearby is the National Trust owned Plas yn Rhiw, above which, on the slopes of Mynydd Rhiw is a late Stone Age burial chamber, and neolithic quarries. Nearby on Mynydd y Graig are three hillforts, several hut circles and terraced fields that are thought to date from the late Iron Age; a Bronze Age cinerary urn was uncovered in 1955. The village forms part of the community of Aberdaron. Common land at Mynydd Rhiw and Mynydd y Graig was enclosed by Act of Parliament in 1811, and barley and oats were grown. Manganese was discovered in 1827; donkeys carried the ore to Porth Cadlan and Porth Neigwl, and in the late 19th century houses were built for industrial workers. By 1914 an aerial ropeway had been constructed, passing over the growing village to a jetty on the shore at Porth Neigwl. In World War I there was a great demand for manganese as a strengthening agent for steel, and the industry became a substantial employer in the village; over of ore were extracted during the lifetime of the mines, and in 1906 the industry employed 200 people. During World War II, coal miners, Cornish tin miners and a contingent of the Royal Canadian Engineers were drafted in to work the mines. Plas yn Rhiw Plas yn Rhiw is a grade II* listed early 17th-century manor house, which contains a stone spiral staircase. The house is believed to be on or near the site of an earlier defended house, built by Meirion Goch in the 10th century to prevent incursions by Vikings into Porth Neigwl. It was remodelled in 1820, when a third storey was built; a stair-wing added to the rear; and the front redesigned with a Georgian façade and 16 pane sash windows, above a ground floor verandah. The house was restored by the Keating sisters in 1939, with advice from Clough Williams-Ellis (who designed and built Portmeiron village), and is now owned by the National Trust. The garden lies below the house and is terraced into the slope, divided by hedges into several small compartments; there are views over Porth Neigwl and Cardigan Bay, and in spring and summer there are displays of snowdrops and bluebells. It is