Lud (Welsh: Lludd map Beli Mawr), according to Geoffrey of Monmouth's pseudohistorical History of the Kings of Britain and related medieval texts, was a king of Britain in pre-Roman times who founded London and was buried at Ludgate.

Lud may be connected with the Welsh mythological figure Lludd Llaw Eraint, earlier Nudd Llaw Eraint, cognate with the Irish Nuada Airgetlám, a king of the Tuatha Dé Danann, and the Brittonic god Nodens.

[1] Lud's reign is notable for the building of cities and the refortification of Trinovantum (London), which he especially loved.

During Lludd's reign, three great plagues befell Britain, but he was able to overcome them with the advice of his brother.

)[3][4][5][7][8] 16th-century statues of King Lud and his two sons, which formerly stood on the gate, now stand in the vestry porch of St Dunstan-in-the-West on Fleet Street, in a state of disrepair.