What is "troed-y-rhiw-sion"

Troed-y-rhiw-Sion is a hamlet in the community of Beulah, Ceredigion, Wales, which is 69.3 miles (111.6 km) from Cardiff and 190.9 miles (307.2 km) from London. Troed-y-rhiw-Sion is represented in the National Assembly for Wales by Elin Jones ( Plaid Cymru) and the Member of Parliament is Mark Williams ( Liberal Democrats).