Caer-Lud was the former name of what capitol city ?
Trinovantum was at some point rebuilt by a pre-Roman figure called King Lud, who was eventually buried beneath Ludgate, and hence its name. Lud's city was known as Caer-Lud (fortress of Lud), and later Kaer Llundain. This whole paragraph is firmly in the realms of myth, with no existing source other than Geoffrey
London
