After Londinium was raided on several occasions by Saxon pirates in the late 3rd century, construction of an additional riverside wall, built in phases, began in 280 CE and was repaired 390 CE. The existence of this riverside section was long doubted due to a lack of evidence, but excavations at the Tower of London in 1977 showed that the section of the inner curtain wall between the Lanthorne and Wakefield Towers was originally the eastern part of the Roman riverside wall that was built or rebuilt in the late 4th century. The riverside wall may have limited access to the Thames, both commercial and otherwise, so it may have reflected a diminished level of activity within the city.