In the summer of 1286, the busiest time during the building of the castle, nearly 950 men were employed – 227 masons, 115 quarriers, 30 smiths, 22 carpenters and 546 labourers.
Ar anterth y gwaith adeiladu yn Harlech yn haf 1286 roedd bron 950 o ddynion yn cael eu cyflogi – 227 o seiri maen, 115 o chwarelwyr, 30 o ofaint, 22 o seiri coed a 546 o lafurwyr.