This wall appears to have been built in the late 2nd or early 3rd century, certainly between 190 and 225, and probably between 200 and 220.London wall was the defensive wall first built by the Romans around the Londinium their strategically important port town on the River Thames in what is now the United Kingdom, and subsequently maintained until the 18th century. It is now the name of a road in the City of London running along part of the course of the wall. Until the later Middle Ages the wall defined the boundaries of the City of London. Although the exact reason for the wall's construction is unknown, it may have been connected to the invasion of northern Britain. No any proof have been received why this bridge was built. The images below are taken from the London museum and so on…