By D Pugh Jones, Glamorgan County Architect. Built in 1932 as Gwyndy Senior Girls School and opened on 25 September 1933. One of the later schools in Caerphilly by Pugh Jones. Later St. Ilan Comprehensive School which closed in 2007. In December 2015 a new £20m Y Gwyndy campus officially opened on site as the new home to Ysgol Gymraeg Caerphilly and Ysgol Gyfyn Cwm Rhymni. The new school campus took its first intake of Year 7 pupils in September 2013, but the official opening marked the end of the third phase of building works.

Updated November 2022.
Sources: Cadw Listed Buildings. ALH 22/05/2013; 'First Minister officially opens new campus for Welsh school', Caerphilly Observer, 11 December 2015