"Lord Cantabrigian British is the name of the ruler of Britannia, and an in-game personification of the creator of the Ultima series, Richard Garriott. The name comes from a nickname given to him by friends at a computer camp, who felt that his way of saying "hello" was distinctly "British." The "Lord" prefix was added when he played the dungeon master in Dungeons & Dragons games. Garriott released early games, such as Akalabeth, under the name and occasionally appeared in Ultima Online playing as Lord British. He is still known as Lord British even after his departure from Ultima maker Origin Systems: Garriott retained the trademark rights to the name Lord British with its associated symbols, and the character appeared in his latest (and now defunct) online game, Tabula Rasa as General British.
Lord British is a man who comes from Earth to Sosaria through a moongate. He adopts the name Cantabrigian British, taken from his birthplace, Cambridge in the United Kingdom, in favor of his old name. He quickly meets the evil wizard, Mondain, and does battle with him. After defeating him, British becomes known as "Champion of the White Light" and "Lord British, Protector of Akalabeth." Numerous plotlines and side-quests in the Ultima games revolve around one of Lord British's adventures or public works projects. He had a key role in founding the Museum, Conservatory, and innumerable institutions of the Britannian society. He also continuously provides healing, resurrection and other miscellaneous help for the Avatar."
Source: Wikipedia, "Lord_british", available under the CC-BY-SA License.