The name of London is derived from a word first attested, in Latinised form, as Londinium. By the first century CE, this was a commercial centre in Roman Britain. The etymology of the name is uncertain. There is a long history of mythicising etymologies, such as the twelfth-century Historia Regum Britanniae asserting that the city's name is derived from the name of King Lud who once controlled the city. However, in recent times a series of alternative theories have also been proposed. As of 2017, the trend in scholarly publications supports derivation from a Brittonic form *Londonjon, which would itself have been of Celtic origin.