Rhys Gryg, real name Rhys ap Rhys, also known as Rhys Fychan, was a Welsh prince who ruled part of the Kingdom of Deheubarth.

Cardigan Castle is a castle overlooking the River Teifi in Cardigan, Ceredigion, Wales. It is a Grade I listed building. The castle dates from the late 11th-century, though was rebuilt in 1244. Castle Green House was built inside the castle walls in the early 1800s. After falling into disrepair the castle was restored in the early 2000s and opened to the public in 2015. It is owned by Ceredigion County Council and now includes a heritage centre and open-air concert facilities. The castle's gardens are listed on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.