This article shows hand-drawn maps of London from the post-Roman/pre-Norman period. What I find particularly fascinating is how the names of people and places translated to place names now, such as Totinge (Tottenham), Brixges Stan (Brixton), and Grenewic (Greenwich). Some of these come from the names of people or things 1500 years ago: Wemba Lea, Wemba's forest clearing, is now Wemberley, and a cheese farm, Ces Wican, is now Chiswick.
Here's the entire map of London in high-res. It's worth a look.