Every timeperiod has its graffitis basically. People of the times were not really different from us on this point.

I wanted to share with you this page referencing the graffitis written on the walls of different buildings of Pompeii, it makes for an interesting and often really funny read.

Viking graffiti in an almost 5,000 year old cairn.

http://www.orkneyjar.com/history/maeshowe/maeshrunes.htm

"Ingigerth is the most beautiful of all women" (carved beside a rough drawing of a slavering dog).