This may sound like a completely stupid question but: How did people find each other in Ancient Rome? I assume that not every street had a name, and Ancient Rome was an insane maze of alleys and roads. And I assume that most buildings, if not all, did not have any numbers on them.

Now, I realize they didn't have mail, and most people didn't get messages via courier in their entire lives. However, I'm certain that sometimes, at some points in time, people had to be found. Say, a visiting relative coming from the provinces who wanted to see their cousin, or people looking for a person for a deposition in the forum, etc....

So, how did that happen? I realize that most towns and cities in antiquity were very small compared to that urban areas in which we live today. But Ancient Rome had about a million people or so - that's a heck of a lot of people. And yes, I realize that you could go to a general area and ask around at the local taberna or baths, but with a million people...that would still be very, very, hit and miss.

So any answers? Did they have "street addresses" in some way at all? Did they register at least the area in which they lived during the census, making it a bit easier to find and ask around?