The name Rhosddu is formed on the Welsh words rhos, "moor" or "rush pasture", and ddu, "black".

[6] It is likely that the area was common land in Medieval times used by tenants of the manor as rough pasture for cattle grazing.

[12] The Dissenters' Burying Ground on Rhosddu Road was originally a field of about one acre on land given to the Wrexham Nonconformists during the early 1600s by the Puritan Daniel Lloyd of Pen y Bryn Farm.

[15] During the night of the Wrexham races, in the mid-1840s, all but one of the brass memorial plates were stolen from the tombs, thus destroying many family histories.

Many notable people are buried here including the great Puritan Morgan Llwyd (d.1659) and the ironmaster William Wilkinson (d.1808).

[18] John Godfrey Parry-Thomas, the engineer and motor-racing driver, was the son of the curate of Rhosddu and lived in the area during his childhood.